Answer
$\sec180^{\circ}=-1$
Work Step by Step
1. What we know about 180 degree angle
$\theta=180^{\circ}$
$x=-1$
$y=0$
$r=1$
2. Substitute in:
$\sec\theta=\frac{r}{x}=\frac{1}{-1}=-1$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 27: 61
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