Answer
The labeled angles each measure 120.
Work Step by Step
In exercise 8 we found that x=30.
Substitute to find the measures of the labeled angles.
$x+90=30+90=120$
$4x=4(30)=120$
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: 11
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