Geometry: Common Core (15th Edition)

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

Chapter 1 - Tools of Geometry - Chapter Test - Page 75: 21



Work Step by Step

By the definition of a linear pair, the noncommon sides of the angles are opposite rays, so they form a line. The measure of a line, or straight angle, is 180, so the measures of a linear pair sum to 180 and are therefore supplementary.
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