Answer
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
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 227: 34
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