Answer
$18.79$
Work Step by Step
Use $b=4$ as the base, we have the height $h=c\ sinA=10sin70^\circ$, thus the area is $K=\frac{1}{2}(4)(10sin70^\circ)\approx18.79$
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: 22
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