Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 229: 36


The angle has a measure of 60$^{\circ}$

Work Step by Step

$\frac{90-a}{180-a}$=$\frac{1}{4}$ 360-4a=180-a 3a=180 a=60
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