Answer
$3.8$ square units
Work Step by Step
By Heron's formula, $K=\sqrt{s(s-a)(s-b)(s-c)}$, where $s=\frac{a+b+c}{2}.$
Hence, here we have
$s=\frac{4+2+5}{2}=5.5$,
Thus,
$K=\sqrt{5.5(5.5-4)(5.5-2)(5.5-5)}\approx3.8$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - Chapter Review - Review Exercises - Page 557: 24
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