Answer
10.95 feet
Work Step by Step
Equation:
$a^{2} + b^{2} = c^{2}$
Substitute in the known lengths
$7^{2} + b^{2} = 13^{2}$
Square the lengths
$49 + b^{2} = 169$
Substratct 49 from both sides
$b^{2} = 120$
Find the square root of both sides
$b = 10.95$
