Answer
Angle A=35 degrees
Work Step by Step
3 angles in a triangle add up to 180.
Step 1: Add the two given angles.
55+90=145
Step 2: Subtract 145 from 180.
180-145=35
Angle A=35
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - 10.2 Triangles - Exercise Set 10.2 - Page 626: 4
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