Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 7 - Similarity - Get Ready! - Page 429: 4


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.
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