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: 40



Work Step by Step

The two angles form a linear pair, so are supplementary. Their measures total 180. The square at the vertex of one angle tells us it is a right angle, which has a measure of 90. $z+90=180\longrightarrow$ subtract 90 from each side $z=90$
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