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.
$3x=3(20)=60$
$80-x=80-20=60$
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
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