Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - 2-5 Reasoning in Algebra and Geometry - Practice and Problem-Solving Exercises: 32

Answer

82

Work Step by Step

By the definition of supplementary angles, the measure of an angle and its supplement sum to 180. $m\angle1+98=180\longrightarrow$ subtract 98 from each side $m\angle1=82$
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