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# Examples of complete angle

An angle of 360 ∘ is called a complete angle. A straight line makes an angle of 360 ∘ to reach its initial position completely by the rotation. Hence, the angle is called as the complete angle. A complete angle is represented same as the zero angle but there is one difference between them and it is the amount of rotation Complete Angle: An angle whose measure is equal to 360° is called a complete angle. It is formed by one complete rotation of one of its arms. Other Types of Angles. Angles are also sometimes classified based on their position, the direction of rotation, the sum of their pairs, or their transversal into the following types: Interior Angles The angle formed here is a straight angle. It measures 180°, which makes is pretty obvious where it gets its name from. A straight angle can be formed by adding two right angles. Straight Angles in Real Life. Reflex and Complete Angles. The angle formed when the ray moves past 180° and lies between 180° and 360° is called a reflex angle

### Complete angle - Math Doubt

Angles are useful in our daily life, so it's important to learn and understand them. For example, the minute hand of a wall clock turns angle 360 degrees to make a minute. It takes the earth 24 hours to rotate at an angle of 360°. And that's how the clocks are designed to synchronize with the rotation of the Earth Definition of Angle explained with real life illustrated examples. Also learn the facts to easily understand math glossary with fun math worksheet online at SplashLearn. SplashLearn is an award winning math learning program used by more than 40 Million kids for fun math practice There are two main ways to label angles: 1. give the angle a name, usually a lower-case letter like a or b, or sometimes a Greek letter like α (alpha) or θ (theta) 2. or by the three letters on the shape that define the angle, with the middle letter being where the angle actually is (its vertex). Example angle a is BAC, and angle θ is. For example 90° means 90 degrees. One Degree. This is how large 1 Degree is . The Full Circle. A Full Circle is 360° Half a circle is 180° (called a Straight Angle) Quarter of a circle is 90° (called a Right Angle The examples of reflex angle are 190 degrees, 220 degrees, 270 degrees, 320 degrees, etc. What is a complete angle? A complete angle is equal to 360 degrees. It is also called full rotation or full angle

In geometry, a straight angle is an angle, whose vertex point has a value of 180 degrees. Basically, it forms a straight line, whose sides lie in opposite directions from the vertex. It is also termed as flat angles A horizontal line and a vertical line are always straight lines and therefore they are examples of straight angles g) Complete angle measures exactly $$360^\circ$$. h) The sum of all the angles on one side of a straight line always measures $$180^\circ$$. i) The sum of all the angles around a point always measures $$360^\circ$$. Types of Angles - Examples a) Example of Zero Angle Types of Angles - Explanation & Examples. Different types of angles exist in nature, and each one of them carries much importance in our daily lives.. For example, architects and engineers use angles when designing machines, buildings, roads, and bridges.. In sports, athletes use angles to enhance their performance. For example, a person must spin with the disk at a certain angle to throw it. Angles which have a common vertex and the sides of the angle are formed by the same lines are known as vertical angles. Vertical angles are equal to each other. In the above figure, 1 and 3, 2 and 4, 6 and 8 and 5 and 7 are vertical angles. Also, 3, 4,5, 6 are known as interior angles and 1,2,7,8 are known as exterior angles What is Straight Angle? Two joining rays make an angle.The common point where these two rays meet is called the vertex and the rays are called arms of the angle.. The measure of an angle is the amount of turn or rotation of a point from one arm to another along its vertex.. When the arms of the angle lie in the opposite direction, they form a straight angle

An obtuse angle is an angle that lies between 90° and 180°. It means an obtuse angle is greater than 90° but less than 180°. In the above picture, the angle ∠RST formed by the intersection of RS and ST which measures 110°. Thus ∠RST=110° is an obtuse angle. Common examples of obtuse angles include 100°, 115°, 145°, 160°, etc If the measure of an angle is 360°, it is a complete angle. This angle is formed as the arm makes one completes turn and returns to its starting position. Other Type of Angles Apart from the above-mentioned angles, there are other types of angles too AA Criterion | Angle-Angle Criterion Definition & Examples. The interior angles of all triangles sum to 180°. If you know the measure of any two angles, you can easily find the third. That is the secret at the heart of the Angle-Angle Similarity Criterion, which says all pairs of triangles with two congruent interior angles are similar Think of an angle opening to a complete rotation. When it is open half way, it is a straight angle. If the angle opens beyond that, it is a reflex angle. Take, for example, a right angle. A right angle really makes two angles. One is the 90 degree angle inside the square corner

### Angle - Definition and Types with Example

• 4. Straight Angle 5. Reflex Angle 6. Complete Angle. 1. Acute Angle. An acute angle is measured when the angle is between 0º but less than 90º. For example, 30º, 60º, 40º are called Acute Angles. From the above figure, ∠ABC represents an acute angle as it consists of less than 90º. ∠ABC < 90º. 2. Right Angle. When the angle is equal.
• Types Of Angles Example Problems With Solutions. Example 1: Find the measure of an angle which is 20° more than its complement. Soluton: Let the measure of the required angle be x°. Then, measure of its complement = (90 - x)°. ∴ x - (90 - x) = 20 ⇔ 2x = 110 ⇔ x = 55 Hence, the measure of the required angle is 55°
• al sides completed different complete rotations ; you would have a coter
• Right angle: The angle that is 90° is a Right angle, ∠C as shown below. Straight angle: The angle that is 180° is a straight angle, ∠AOB in the figure below. Supplementary angles: In the figure above, ∠AOC + ∠COB = ∠AOB = 180° If the sum of two angles is 180° then the angles are called supplementary angles
• The Obtuse Triangle has an obtuse angle (an obtuse angle has more than 90°). In the picture on the left, the shaded angle is the obtuse angle that distinguishes this triangle. Since the total degrees in any triangle is 180°, an obtuse triangle can only have one angle that measures more than 90°

### Types of Angles Learn with Real-Life Example

An angle equal to 1 turn (360° or 2 π radians) is called a full angle, complete angle, round angle or a perigon. An angle that is not a multiple of a right angle is called an oblique angle. The names, intervals, and measuring units are shown in the table below The angle formed by a straight line is called a straight angle. It is one-half of the whole turn of a circle. The measure of the straight angle is 180°. Reflex Angle. A reflex angle is an angle whose measure is greater than 180° but less than 360° Complete Angle. When a measurement of an angle is equal to 360 degrees it is a complete angle Continue reading to know the examples of Bad posture. 13. Downards Rotated Shoulder Blades. 14. Duck Feet. Continue reading to know the examples of Bad posture. Exercises to Help Posture. Conclusion And Recommendation. There are several examples of bad posture and there are different ways to improve them The included side means the side between two angles. In other words it is the side 'included between' two angles. Identify Angle Side Angle Relationships. In which pair of triangles pictured below could you use the Angle Side Angle postulate (ASA) to prove the triangles are congruent

### Angles - Explanation & Example

1. The HA Theorem. If you're a triangle, finding out that you're congruent to another triangle is a big deal. Imagine finding out one day that you have a twin that you didn't know about
2. Example: Use a protractor to find the measure of ∠MLN in the diagram below. First, make sure that you correctly identify the angle in question. ∠MLN is the angle formed by points M, L, and N with a vertex at point L. Notice that the ∠MLN is now colored in the diagram below
3. Real life examples of geometric angles. 2. An acute angle is anything angle that is less than 90 degrees. 3. A right angle is any angle that is exactly 90 degrees. 4. An obtuse angle is any angle that is more than 90 degrees but less than 180 degrees. 5. A straight angle is any angle that equals 180 degrees
4. Angles are measured in degrees, which is a measure of circularity, or rotation. A full rotation, which would bring you back to face in the same direction, is 360°. A half-circle is therefore 180°, and a quarter-circle, or right angle, is 90°. Two or more angles on a straight line add up to 180 °. In the diagram above, the circle to the left.

There are many uses of angles. One of them is architecture. If you want a rectangular room and walls that are straight, you need angles. Another use is in bearings. These are 3 digit angles (eg 005, 097, 233) used to locate ships and aeroplanes us.. Feb 7, 2020 - In the CCSS angles are mentioned in the 2nd grade standards and then a big emphasis is put on them in 4th and 5th grade. See more ideas about math classroom, math geometry, teaching math So I'll draw my unit circle with an ending angle side in QIII: To see if this is one of the basic reference angles whose values I've memorized, I'll subtract the given angle from the upper end of QIII: 270 - 225 = 45. Okay, so this is the basic 45-45-90 triangle, whose legs (in the unit circle) have lengths of. 1 2. \frac {1} {\sqrt {2\,}} 2

An included angle or side is physically between the others in the triangle. So Side Angle Side (SAS) means one side, the angle next to that side, and then the side next to that angle. That side is out there, all alone, not between the angles. For every testing method, you are checking the three parts identified between the two triangles Complete list of bone markings. Bone markings are projections and depressions found on bones ﻿, which help us to identify the location of other body structures, such as muscles. Their importance comes when we try to describe the shape of the bone or to understand how the muscles ﻿, ligaments and other structures affect this bone and vice versa 8 Powerful Examples! Now we are ready to learn the special case of the Sum and Difference Formulas: the Half-Angle Identities! Remember when we discussed how 15 degrees can be expressed as 60 degrees minus 45 degrees, and then use a Sum and Difference Identity to calculate further? Well, with Half-Angle identities we have yet another option

An exterior angle is an angle formed by the extension of one side of a triangle. The remote interior angles are the two interior angles of the triangle not adjacent to the exterior angle. Example: Identify the exterior angle and the remote interior angles in each problem, then solve for the missing angle. Show Video Lesso Angles: Acute, Obtuse, Straight and RightThere are four types of angles depending on their size in degrees. These are: Right anglesStraight anglesAcute anglesObtuse anglesRight anglesRight angles are angles that have a measure of exactly 90°. For example, the angle at the corner of a square or rectangle is a righ An angle inscribed in a semi-circle is a right angle. In a circle, inscribed angles that intercept the same arc are congruent. The opposite angles in a cyclic quadrilateral are supplementary: In a circle, or congruent circles, congruent central angles have congruent arcs For example, if we bisect 60° angle we will get 30° as a result. This means 60° angle is divided into two equal angles (30° each). Hence 60° angle can only be bisected once. Further, we can again bisect 30° angle into two equal angles as (15° each). Explore math program

### What is an Angle? - [Definition, Facts & Example

Example Problems of Angle of Elevation and Depression : Here we are going to see some example problem of trigonometry using angle of elevation and depression. Example Problems of Angle of Elevation and Depression. Question 13 : A boy standing on the ground, spots a balloon moving with the wind in a horizontal line at a constant height Now, let us calculate the angle of asymptotes with the formula given below:: q lies between 0 to P-Z-1. So, in this case, θ will be calculated for q = 0, 1 and 2. So, these three are the angle possessed by asymptotes approaching infinity. Now, let us check where the centroid lies on the real axis by using the formula given below A 190 degree angle is not obtuse. An obtuse angle has a measurement greater than 90 degrees but less than 180 degrees. However, A reflex angle measures more than 180 degrees but less than 360 degrees. So, an angle of 190 degrees would be reflex. Comment on Anthony Fritz's post A 190 degree angle is not obtuse

EXAMPLES OF SOLVING TRIGONOMETRY WORD PROBLEMS. Example 1 : A ramp for unloading a moving truck, has an angle of elevation of 30°. If the top of the ramp is 0.9 m above the ground level, then find the length of the ramp An angle bisector of a triangle divides the opposite sides into two segments whose lengths are proportional to the lengths of the other two sides. Angle-angle-side Congruence Theorem AAS If two angles and a non-included side of one triangle are equal in measure to the correspondin In each example, pay close attention to the information given and what we are trying to find. This helps you determine the correct values to use in the different parts of the formula. Example. Find the value of $$x$$. Solution. The side opposite the right angle is the side labelled $$x$$. This is the hypotenuse Congruent Angles Congruent angles are angles with exactly the same measure. Example: In the figure shown, ∠ A is congruent to ∠ B ; they both measure 45 ° . Congruence of angles in shown in figures by marking the angles with the same number of small arcs near the vertex (here we have marked them with one red arc). *See complete details.

In the above example of clock, the two hands initially make smallest angle 0° and on one complete rotation by the minute hand, the two hands make maximum angle and is named as the angle 360 degree or 360°. The angles in a complete turn add up to 360 degrees. If one complete rotation is divided into 360 equal parts, the measure of each such. angles between points that found the boundary of a site We will learn several different techniques to compute the area inside a traverse Introduction Surveying - Traverse Example Side Length (ft.) Latitude Departure degree minutes AB S 6 15 W 189.53 -188.403 -20.634 BC S 29 38 E 175.18 -152.268 86.61 Positive and negative coterminal angles. If you want to find a few positive and negative coterminal angles, you need to subtract or add a number of complete circles.But how many? One method is to find the coterminal angle in the [0,360°) range (or [0,2π) range), as we did in the previous paragraph (if your angle is already in that range, you don't need to do this step) Reflex Angles explained. There are six types of angle in total; An Acute angle is the smallest, measuring more than 0 ° but less than 90 °.. Next up is a Right angle, also taught as a quarter turn.This angle always measures 90 °.. An Obtuse angle measures more than 90 ° but less than 180 °.. A Straight angle or a half turn is always 180 °.. Reflex is the next largest measuring more than. Examples of obtuse angles around the house: Blades of a ceiling fan Clock showing 8 o'clock Base of a tripod A fully opened cupboard door A coat hanger A clothes stand Steering wheel of the car A book kept open for reading Shower nozzle Flowers ar..

Examples of Inclined Planes: 1. Wheelchair ramps. A wheelchair ramp has become a necessary inclined plane in all of society. The wheelchair begins at a lower level and rather than being lifted up to the higher level, a ramp is used to push the wheelchair up. The distance needed to push the wheelchair becomes further, but the force and energy. Angles are measured in degrees, but they may also be measured in radians-more on that in an upcoming post. We're familiar with degrees; for example, a right angle has 90 degrees. There are 360 degrees in a circle. Cut the circle in half, and the straight line that bisects it is said to have an angle of 180 degrees An angle inscribed in a semi-circle is a right angle. In a circle, inscribed circles that intercept the same arc are congruent. The opposite angles in a cyclic quadrilateral are supplementary. In a circle, or congruent circles, congruent central angles have congruent arcs Tan of the Average of 2 Angles . With some algebraic manipulation, we can obtain: tan\ (alpha+beta)/2=(sin alpha+sin beta)/(cos alpha+cos beta) Example 1. Find the value of sin 15^@ using the sine half-angle relationship given above. Answe The cosine double angle formula tells us that cos(2θ) is always equal to cos²θ-sin²θ. For example, cos(60) is equal to cos²(30)-sin²(30). We can use this identity to rewrite expressions or solve problems. See some examples in this video

Example 1: The angle between the minute hand and the hour hand of a clock when the time is 4:20 is: Solution: At 4:00, hour hand was at 120 degrees. Using the concept of relative distance, the minute hand will cover = =110 degrees. The angle between the hour hand and minute hand is = 120-110 = 10 degrees. Example 2: The angle between the minute. The zero angle is usually represented in three different forms mathematically. Zero degrees, written as $0^°$. Zero radians, written as $0$. Zero gradians, written as $0^g$. It is time to study the geometrical formation of zero angle. Formation. There are two possible cases of forming zero angle in geometrical system. Zero angle of a Lin We can find the third angle by using the law: sum of all angles of a triangle = 180 o. After finding this third angle we can apply the sine rule to find other parameters. Example: Find the length 'a' in figure 1, If ∠A = 40 o, ∠C = 70 o and side c = 5 cm. Solution: Using the sine rule we can solve this triangle

A transversal is a line that intersects two or more coplanar lines, each at a different point. What this means is that, two lines are intersected by a third line, and in so doing, creates six angle-pair relationships as demonstrated below: Interior angles: ∠3,∠4,∠5,∠6. Exterior angles:∠1,∠2,∠7,∠8. Pairs of alternate exterior. A right-angle triangle is a special triangle in which one angle is 90 o and the other two are less than 90 o. Furthermore, each side of the right angle triangle has a name. Hypotenuse: It is the largest side of the triangle. Also, it is opposite the right angle of the triangle. Base: The side on which the right angle triangle stands is known as. Begin your presentation with a right angle. Demonstrate how a right angle measures 90 degrees with a protractor. Ask students to name some items in the room with a right angle. Example: the corner of a book, the corner on the window. Introduce the other angles by referring to and comparing them to the right angle Rotation Angle. When objects rotate about some axis—for example, when the CD (compact disc) in Figure 6.2 rotates about its center—each point in the object follows a circular arc. Consider a line from the center of the CD to its edge. Each pit used to record sound along this line moves through the same angle in the same amount of time. The. For example, from the given area of the triangle and the corresponding side, the appropriate height is calculated. From the known height and angle, the adjacent side, etc., can be calculated. They use knowledge, e.g., formulas (relations) Pythagorean theorem, Sine theorem, Cosine theorem, Heron's formula, solving equations and systems of equations

### Video: Angles - Acute, Obtuse, Straight and Righ

For example, taking a different link as the fixed link, the slider-crank mechanism shown in Figure 5-14a can be inverted into the mechanisms shown in Figure 5-14b, c, and d. Different examples can be found in the application of these mechanisms. For example, the mechanism of the pump device in Figure 5-15 is the same as that in Figure 5-14b When the two sides of a triangle are equal...Complete information about the isosceles triangle, definition of an isosceles triangle, examples of an isosceles triangle, step by step solution of problems involving isosceles tr Click here for the videos: Advancing contact angle, Receding contact angle If we measure the contact angle while the volume of the drop is increasing - practically this is done just before the wetting line starts to advance-we get the so called advancing contact angle θ A.If we afterwards decrease the volume of the drop and determine the contact angle just before the wetting line is receding.

### Degrees (Angles

Angle-side-angle is a rule used to prove whether a given set of triangles are congruent. The AAS rule states that: If two angles and a non-included side of one triangle are equal to two angles and a non-included side of another triangle, then the triangles are congruent. In the diagrams below, if AC = QP, angle A = angle Q, and angle B = angle. The earliest known work on conic sections was by Menaechmus in the 4th century BC. He discovered a way to solve the problem of doubling the cube using parabolas. (The solution, however, does not meet the requirements of compass-and-straightedge construction.)The area enclosed by a parabola and a line segment, the so-called parabola segment, was computed by Archimedes by the method of.

### Reflex Angle (Definition, Example, How to Draw

The Converse of Same-Side Interior Angles Theorem Proof. Let L 1 and L 2 be two lines cut by transversal T such that ∠2 and ∠4 are supplementary, as shown in the figure. Let us prove that L 1 and L 2 are parallel.. Since ∠2 and ∠4 are supplementary, then ∠2 + ∠4 = 180°. By the definition of a linear pair, ∠1 and ∠4 form a linear pair complement: [noun] something that fills up, completes, or makes perfect. one of two mutually completing parts : counterpart Figure 1.7.3.1: Diagram demonstrating trigonometric functions in the unit circle., \). The values of the other trigonometric functions can be expressed in terms of x, y, and r (Figure 1.7.3 ). Figure 1.7.3.2: For a point P = (x, y) on a circle of radius r, the coordinates x and y satisfy x = rcosθ and y = rsinθ

Three Main Types of Angles. Acute - any angle which measures less than 90 degrees. These angles appear sharp, like the blade on a knife. Example: The angle ABC measures 40 degrees. Angle ABC is acute. Right - any angle which measures exactly 90 degrees. These are like the edges of a wooden block. Sample: The angle CAT measures 90 degrees Angles Parts of an Angle An angle consists of two rays with a common endpoint (or, initial point). Each ray is a side of the angle. The common endpoint is called the vertex of the angle. Naming Angles Angles can be named in one of two ways: Point‐vertex‐point method

There is always an obtuse angle within an obtuse triangle. Examples of Obtuse Angles. The following examples show that these angles always measure between 90º and 180º. 120º angle; This is an obtuse angle because 120 is a number greater than 90 and less than 180. So this angle measurement is between 90º and 180º: 90º < 120º < 180º. Unit Circle Trigonometry Drawing Angles in Standard Position Examples The following angles are drawn in standard position: 1. θ=40D 2. 160θ= D 3. θ=−320D Exercises Sketch each of the following angles in standard position. (Do not use a protractor; just draw a brief sketch.) 1. 120θ= D 2. 45θ=− D 3. 130θ=− D 4. θ=270D θ=−90D 6.

### Straight Angle (Definition, Examples and Construction

A complete turn = 360°. Practice Unlimited Questions. 2. Clockwise and Anti-clockwise Directions. The direction in which the hands of a clock move is known as the clockwise direction. The direction of movement opposite to the hands of a clock is known as the anti-clockwise or counter-clockwise direction. Practice Unlimited Questions Master Camera angles, shots, and movements, truly the backbone of visual storytelling, with this post. Whatever tools you have, you need a complete understanding of these fundamental concepts. We cover EVERY Camera shot, movement, and angle in great depth with a host of examples and FREE infographics Lines, Rays, and Angles. This fourth grade geometry lesson teaches the definitions for a line, ray, angle, acute angle, right angle, and obtuse angle. We also study how the size of the angle is ONLY determined by how much it has opened as compared to the whole circle. The lesson contains many varied exercises for students Complete each selected views. 4. Complete the dimensions and notes. 45 152 152 64 25~4 0 Front Top Choose a drawing scale (say 1:1) Front Top y x x x x y y z. View selection procedures 1. Orient the object to the best position relative to BY FIRST ANGLE PROJECTION METHOD Example-6. Example-7 x y FV 35 35 10 TV 10 20 30 40 70 O FOR T.V. angle one is congruent angle two is given. from the diagram angle one and angle two are corresponding angles. so by the converse of the corresponding angles postulate L is parallel to M use the information measurement of angle 1 is (3x + 30)° and measurement of angle 2 = (5x-10)°, and x = 20, and the theorems you have learned to show that L.

### Types of Angles: Angle Definition, Types, Properties, Example

Improve your math knowledge with free questions in Proofs involving angles and thousands of other math skills Angle of Elevation Examples More Free online math examples, which helps to build confidence, enthusiasm and to improve the mathematics, problem solving, and higher order thinking skill Insert Image. Dutch Angle Shot. Insert Image. Overhead Shot. Insert Image. Aerial Shot. Camera Angle Guide. Create Free Shot List. Y ou're looking for a list of the different camera angles in film, but you also want great examples that come with clear explanations of when and why to use specific camera shot angles Collaboration and Cooperation Part 1 Commitment and Professionalism Part 2 Attendance and Punctuality Part 3 Productivity and Quality of Work Part 4 Adaptability Part 5 Communication and Interpersonal Skills Part 6 Creativity and Innovation Part 7 Accountability Part 8 Customer Focus and Customer Satisfaction Part 9 Decision-Making and Problem-Solving Part 10 Dependability and Reliability..

### Types of Angles - Explanation & Example

Example: An object is kicked at a velocity of 2 m/s at an angle of 30°. Find the horizontal and vertical velocity components. 2 m/s 30° vH vv= 1 m/s = 1.73 m/s *make sure you are in degree mode R évsin : à ; R Ûvcos : à ; R é L :2sin 30 R Û L :2cos 30 R é L2.5 ; R Û L :2 :.86 Subtraction of Angles Example 9: Writing Proofs Example 10: Example 11: 13 SUMMARY 1. REASON: 2. REASON: 3. REASON: 4. REASON: 14 Day 2 - Homework 1 2. 3. 15 4. Given: DF # BE Prove: ED # BF 5. 6. D X A B E C F Prove: 16 Definition. Complete angle - An angle whose measure is 360°, is called a complete angle. Equal angle - Two angles are said to be equal , if they have the same measure. Complementary angleTwo angles are said to be complementary if the sum of their measures is 90. For example, angles measuring 65° and 25° are complementary angle A 30-60-90 triangle is a right triangle with angle measures of 30º, 60º, and 90º (the right angle). Because the angles are always in that ratio, the sides are also always in the same ratio to each other. The side opposite the 30º angle is the shortest and the length of it is usually labeled as x. The side opposite the 60º angle has a. Example: Given that sin(A)= 3/5 and 90 o < A < 180 o, find sin(A/2). Solution: First, notice that the formula for the sine of the half-angle involves not sine, but cosine of the full angle. So we must first find the value of cos(A). To do this we use the Pythagorean identity sin 2 (A) + cos 2 (A) = 1. In this case, we find

A couple of different units of angle measure are extensively used, including degree, radian, and gradian (gons): As an example, 1 complete circle (turn) = 360° = 2π radian = 400 gon. However it is not particularly annotated by (°) for degree or (g) for gradian, all values for angles are assumed to be given in radian A revolution is one complete rotation, where every point on the circle returns to its original position. One revolution covers 2 π 2 π radians (or 360 degrees), and therefore has an angle of rotation of 2 π 2 π radians, and an arc length that is the same as the circumference of the circle. We can convert between radians, revolutions, and. Solution to Example 4. In triangle ABC, the third angle ABC may be calculated using the theorem that the sum of all three angles in a triangle is equal to 180 derees. Hence angle ABC = 180 - (25 + 125) = 30 degree