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Only one of these angles contains the third side of the triangle in its interior, and this angle is called an interior angle of the triangle. [4] In the picture below, the angles ∠ABC, ∠BCA and ∠CAB are the three interior angles of the triangle. An exterior angle is formed by extending one of the sides of the triangle; the angle between ...
An exterior angle of a triangle is an angle that is a linear pair (and hence supplementary) to an interior angle. The measure of an exterior angle of a triangle is equal to the sum of the measures of the two interior angles that are not adjacent to it; this is the exterior angle theorem. [34]
In trigonometry, the gradian – also known as the gon (from Ancient Greek γωνία (gōnía) 'angle'), grad, or grade [1] – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 degrees.
Since angle B is supplementary to both angles C and D, either of these angle measures may be used to determine the measure of Angle B. Using the measure of either angle C or angle D, we find the measure of angle B to be 180° − (180° − x) = 180° − 180° + x = x. Therefore, both angle A and angle B have measures equal to x and are equal ...
Prentice Hall is the publisher of Magruder's American Government as well as Biology by Ken Miller and Joe Levine, and Sociology and Society: The Basics by John Macionis. Their artificial intelligence series includes Artificial Intelligence: A Modern Approach by Stuart J. Russell and Peter Norvig and ANSI Common Lisp by Paul Graham.
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