Answer
$$ d = 9 \ ft$$
Work Step by Step
Using proportions, we find:
$$ \frac{8\ ft}{6 \ ft} = \frac{12\ ft}{d} $$
Cross multiplying:
$$ 8d = 72 \\ d = 9 \ ft$$
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 - 8.9 Similar Triangles - 8.9 Exercises - Page 602: 26
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