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

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. $x+90=30+90=120$ $4x=4(30)=120$

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