Answer
$Area=5.35$
Work Step by Step
$s=\frac{a+b+c}{2}=\frac{2.5+10.2+8}{2}=10.35$
$Area=\sqrt {s(s-a)(s-b)(s-c)}=\sqrt {10.35(10.35-2.5)(10.35-10.2)(10.35-8)}=\sqrt {10.35(7.85)(0.15)(2.35)}=5.35$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - 8.2 - Law of Cosines - 8.2 Exercises - Page 574: 39
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