Answer
Hypotenuse $\approx 11.7$ yd.
Work Step by Step
Let $H =$ hypotenuse of the triangle
$a^{2} + b^{2} = c^{2}$
$4^{2} + 11^{2} = H^{2}$
$16 + 121 = H^{2}$
$137 = H^{2}$
$H = \sqrt 137$
$H = 11.704...$
$H \approx 11.7$ yd
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