Answer
120$^{\circ}$
Work Step by Step
$\angle$STR=90 because it is inscribed in a semicircle.
Since ST is equal to half SR (the hypotenuse of STR), then STR is a 30 60 90 triangle.
Arc TR=2$\angle$S
Arc TR=2(60)=120$^{\circ}$
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 285: 10b
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