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 - Page 78: 12



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. $2a\div2=12\div2$ $a=6$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.