Answer
$2\bar{0}~cm$
Work Step by Step
Since the area of a rectangle is length times width ($A=l w$), we have
$$
l=\frac{A}{w}=\frac{280 \ cm^2}{ 14\ cm}=2\bar{0} \ cm
.$$
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: 14
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