Answer
$87^\circ$
Work Step by Step
$x=81^\circ+2(90-x)\\3x=261\\x=87^\circ$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - 10.1 Points, Lines, Planes, and Angles - Exercise Set 10.1 - Page 616: 24
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