Algebra and Trigonometry 10th Edition

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



Work Step by Step

$s=\frac{a+b+c}{2}=\frac{2.5+10.2+8}{2}=10.35$ $Area=\sqrt {s(s-a)(s-b)(s-c)}=\sqrt {10.35(10.35-2.5)(10.35-10.2)(10.35-8)}=\sqrt {10.35(7.85)(0.15)(2.35)}=5.35$
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