Answer
The answer is 70 by the vertical angles theorem.
Work Step by Step
Since angle 1 is 70 degrees, angle 4 is also 70 degrees because angle 4 is across from angle 1 which makes them congruent by vertical angles theorem.
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: 4
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