Answer
$4.15 \, m$
Work Step by Step
$s = \dfrac{1}{2}(a+b+c) = \dfrac{1}{2}(2.1+2.3+3.9) = 4.15 \, m$
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: 9
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