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.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 6 - Section 6.1 - Circles and Related Segments and Angles - Exercises - Page 287: 39
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