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 - 3-2 Properties of Parallel Lines - Lesson Check - Page 152: 3

Answer

70

Work Step by Step

$\angle1\cong\angle5\longrightarrow$ corresponding angles theorem $\angle5\cong\angle8\longrightarrow$ vertical angles theorem $\angle1\cong\angle8\longrightarrow$ transitive property of congruency $m\angle1=m\angle5\longrightarrow$ definition of congruent
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