Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - Chapter Test: 16

Answer

71

Work Step by Step

Let $\angle A$ be the angle. Write and solve an equation. $m\angle A+(m\angle A-52)=90\longrightarrow$ definition of complement $2m\angle A - 52=90\longrightarrow$ combine like terms $2m\angle A=142\longrightarrow$ addition property of equality $m\angle A=71\longrightarrow$ division property of equaliity
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