Answer
The missing length is $39$ ft.
Work Step by Step
1. Find the missing length using the Pythagorean Formula
$ a^{2} + b^{2} = c^{2}$
$c = \sqrt(a^{2} + b^{2})$
$c = \sqrt(15^{2} + 36^{2})$
$c = \sqrt (1521)$
$c = 39$ ft
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