Geometry: Common Core (15th Edition)

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

Chapter 3 - Parallel and Perpendicular Lines - Chapter Review: 13

Answer

120 degrees

Work Step by Step

We know that angles one and two are vertical angles. Thus, they fulfill the requirements of the vertical angles theorem and are parallel. Since angle one is a corresponding angle to the 120 degree angle, they are both 120 degrees.
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