Answer
$A =70^\circ$
$a \approx9.40$
$b \approx3.42$
Work Step by Step
1. $A=90-20=70^\circ$,
2. $a=10cos20^\circ\approx9.40$
3. $b=10sin20^\circ\approx3.42$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 7 - Applications of Trigonometric Functions - Chapter Review - Review Exercises - Page 578: 6
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