Answer
Ans. $18.186cm^2$
Work Step by Step
Given:- $A=60°$ b=3cm c=7cm
We know that
$∆=1/2bcsinA$
$∆=1/2×3×7×sin60° , sin60°=√3/2$
$=1/2×3×7×√3/2=18.186cm^2$
Calculus, 10th Edition (Anton)
by Anton, Howard
Published by
Wiley
ISBN 10:
0-47064-772-8
ISBN 13:
978-0-47064-772-1
Appendix B - Trigonometry Review - Exercise Set B - Page A25: 39
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