Answer
$15\sqrt 3$ (or 25.98) $mi^2$
Work Step by Step
$s=1/2*(6+10+14)$
$s=1/2*(30)$
$s=15$
$A=\sqrt {s*(s-a)(s-b)(s-c)}$
$A=\sqrt {15*(15-6)(15-10)(15-14)}$
$A=\sqrt {15*9*5*1}$
$A=\sqrt {3*5*9*5}$
$A=5\sqrt {3*9}$
$A=15\sqrt {3}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.6 - Radical Equations and Problem Solving - Exercise Set - Page 732: 75
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