Answer
The third angle of the triangle is $70˚$.
Work Step by Step
Let $x =$ third angle of the triangle
$70 + 40 + x = 180$ (Angles in a triangle add to $180˚$)
$110 + x = 180$
$x = 70˚$
Therefore the third angle of the triangle is $70˚$.
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 8 - Geometry - Review Exercises - Page 615: 30
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