Answer
$$ 352 \ in^2 .$$
Work Step by Step
The area of the trapezoid is given by
$$Area=\frac{Sum\ of \ parallel\ bases}{2}\times height= \frac{21+23}{2} \times 16= 352 \ in^2 .$$
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 391: 15
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