Answer
$$4480\ ft^2$$
Work Step by Step
The area of a trapezoid is
$$area\ = \frac{1}{2} \times sum \ of \ bases \times hieght\\
=\frac{1}{2}(40+72)\times 80=4480\ ft^2$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 2 - Cumulative Review - Page 134: 7
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