Answer
$525in^2$.
Work Step by Step
The area of a triangle: $0.5\cdot (base1+base2)\cdot height$.
hence here the area: $0.5\cdot(30+40)\cdot 15=35\cdot15=525in^2$.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - Chapter 10 Test - Page 684: 12
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