Answer
$b=181.66\;ft$.
Work Step by Step
The given values are
One leg $a=245\;ft$.
Hypotenuse $c=305\;ft$.
By using the Pythagorean theorem.
$b=\sqrt{c^2-a^2}$
Plug all values.
$b=\sqrt{(305\;ft)^2-(245\;ft)^2}$
Simplify.
$b=\sqrt{93025\;ft^2-60025\;ft^2}$
$b=\sqrt{33,000\;ft^2}$
$b=181.66\;ft$ (rounded value).
