## Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole

# Chapter 6 - Section 6.1 - Circles and Related Segments and Angles - Exercises: 10b

#### 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$^{\circ}$

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