Answer
-1.40
Work Step by Step
We know that there are pi radians per 180 degrees. Thus, we find:
$$=-80^{\circ} \times \frac{\pi\ radians}{180^{\circ}}=-1.40$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - Chapter Review - Page 899: 9
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