Geometry: Common Core (15th Edition)

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

Chapter 1 - Tools of Geometry - Common Core Cumulative Standards Review - Selected Response: 12

Answer

6

Work Step by Step

Let a be the measure of the angle. By the definition of complement, the measure of the complement is $90-a$. Restate the sentence as an expression. $a=(90-a)-78$ Simplify. $a=12-a$ Add a to each side. $a+a=12$ $2a=12$ Divide each side by 2. $2a\div2=12\div2$ $a=6$
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