Answer
$8.94$ (approximately)
Work Step by Step
Apply Pythagorean theorem.
$c^2=a^2+b^2$
Plug $a=4 ft$ and $b= 8 ft$.
We have $c^2=16+64$
or, $c^2=80$
or, $c=\sqrt {80}$
or, $c=4\sqrt 5$
or $c=8.94$ (approximately)
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 8 - Section 8.1 - The Square Root Property and Completing the Square - Exercise Set - Page 595: 86
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