Answer
see the attached photo
Work Step by Step
In RST, the letter in the middle is the vertex angle, and the other letters are on either side.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 1 - Tools of Geometry - 1-4 Measuring Angles - Practice and Problem-Solving Exercises - Page 31: 15
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