Answer
.894
Work Step by Step
First we find:
$$h=\sqrt{.1^2+.2^2} = .224$$
Using trigonometry, we find:
$$sin\theta = \frac{o}{h} =\frac{.1}{.224}=.446$$
And:
$$cos \theta = \frac{a}{h} =\frac{.2}{.224}=.894$$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 8 - Triangle Trigonometry and Polar Coordinates - 8.1 Trig Functions and Right Triangles - Exercises and Problems for Section 8.1 - Exercises and Problems - Page 332: 5
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