Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 8 - Geometry - Review Exercises: 101

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 $72˚$
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