Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 6 - Section 6.4 - Some Constructions and Inequalities for the Circle - Exercises - Page 314: 13


The angle is 60 degrees.

Work Step by Step

First, draw the circle, placing point Q at the center. Then, recall that the tangent to the circle is the line that is parallel to the circle when it goes through the edge of the circle. Thus, drawing point V, draw the tangent segments, starting at point V. Be sure to put V in a spot that makes the lengths of the segments equal to the diameter. Once this is drawn, you will have an equilateral triangles, where all angles are 60 degrees. Thus, the measure of the desired angle is 60 degrees.
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