Elementary Geometry for College Students (5th Edition)

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

Chapter 6 - Section 6.1 - Circles and Related Segments and Angles - Exercises - Page 288: 39

Answer

The definition of an isosceles triangle is when two legs are congruent to each other. Because the book states that ST and TV are congruent, it follows that STV must be an isosceles trapezoid.
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