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 - Page 119: 30

Answer

28

Work Step by Step

Solve the given equation for $m\angle A$. $2(m\angle A)+17=45\longrightarrow$ subtract 17 from each side $2(m\angle A)=28\longrightarrow$ divide each side by 2 $m\angle A=14$ Substitute to find $m\angle B$. $m\angle B=2(m\angle A)=2(14)=28$
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