Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 13, Trigonometric Ratios and Functions - Chapter Test - Page 901: 23



Work Step by Step

The area of a triangle with sides $a,b,c$ is: $\sqrt{s(s-a)(s-b)(s-c)}$ where $s=0.5(a+b+c)$. Hence here $s=0.5(8+6+7)=10.5$, thus the area: $\sqrt{10.5(10.5-8)(10.5-6)(10.5-7)}\approx20.33$
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