Answer
The unknown angle is $72˚$
Work Step by Step
Let $D =$ unknown angle in the triangle
$D + 48 + 60 = 180$ (Angles in a triangle add to $180˚$)
$D + 108 = 180$
$D = 72˚$
Therefore the unknown angle is $72˚$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 8 - Geometry - Mixed Review Exercises - Page 618: 30
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