Answer
$$20\bar{0}\ ft^2 .$$
Work Step by Step
The area is given by
$$\frac{1}{2} (sum\ of\ parallel\ bases)\times height=\frac{1}{2}(15+25)\times10=20\bar{0}\ ft^2 .$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Section 12.2 - Quadrilaterals - Exercise - Page 393: 43
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