Answer
$A = 217.5yd^2$
Work Step by Step
$A = 15*21 - \frac{13*15}{2} = 315 - 97.5 = 217.5yd^2$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 8 - Geometry - Summary Exercises - Perimeter, Circumference and Area - Page 578: 17
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