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: 1


70. If lines are parallel, same-side interior angles are supplementary.

Work Step by Step

Looking at the diagram you see that lines a and b are parallel to each other. A transversal line intersects parallel lines a and b, making the same-side interior angles 1 and 110 degrees. These angles are supplementary angles meaning they add up to 180 degrees. 180-110=70
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