Geometry: Common Core (15th Edition)

by Charles, Randall I.

Published by Prentice Hall

ISBN 10: 0133281159

ISBN 13: 978-0-13328-115-6

Chapter 2 - Reasoning and Proof - 2-6 Proving Angles Congruent - Practice and Problem-Solving Exercises - Page 124: 9

Answer

Each of the labeled angles measures 60.

Work Step by Step

In exercise 6 we found that $x=20$. Substitute to find the measure of the labeled angles. $3x=3(20)=60$ $80-x=80-20=60$

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