Answer
The answer is 70 by alternate interior angles.
Work Step by Step
Since you already know that angle 1 equals 70 degrees. Angle 3 will also equal 70 degrees because angle 1 and 3 are congruent by alternate interior angle.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 7 - Similarity - Get Ready! - Page 429: 3
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