Answer
The missing length is $12$ m.
Work Step by Step
1. Find the missing length using the Pythagorean Formula
$ a^{2} + b^{2} = c^{2}$
$a = \sqrt(c^{2} - b^{2})$
$a = \sqrt(13^{2} - 5^{2} )$
$a = \sqrt (144)$
$a = 12$ m
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