Answer
See below.
Work Step by Step
Heron's formula says that the area of a triangle with sides $a,b,c$ and semiperimeter $s=0.5(a+b+c)$ is: $\sqrt{s(s-a)(s-b)(s-c)}$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 7 - Section 7.4 - The Area of a Triangle - 7.4 Problem Set - Page 396: 6
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