Answer
50$^{\circ}$
Work Step by Step
To find the complement of an angle simply subtract the given angle from 90$^{\circ}$.
90$^{\circ}$ - 40$^{\circ}$ = 50$^{\circ}$
Therefore the complement of 40$^{\circ}$ is 50$^{\circ}$.
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 - 8.2 Angles and Their Relationships - 8.2 Exercises - Page 544: 7
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