Answer
$70^\circ$.
Work Step by Step
The angles of a triangle add up to $180^\circ$, thus Angle 1 is: $180-(40+70)=180-110=70^\circ$.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - Chapter 10 Test - Page 684: 3
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