Answer
$\approx170.34$
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 $s=0.5(18+25+19)=31$, thus the area: $\sqrt{31(31-18)(31-25)(31-19)}\approx170.34$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - 13.6 Apply the Law of Cosines - 13.6 Exercises - Quiz for Lessons 13.5-13.6 - Page 894: 11
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