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The diagonal length ( $D$ ) of a rectangle with side lengths $L$ and $W$ is given by:

$\displaystyle{ D=\sqrt{L^2+W^2} }$

Determine the diagonal length of rectangles with $L={6\ {\rm ft}}$ and $W={8\ {\rm ft}}$ .

The diagonal length of rectangles with $L={6\ {\rm ft}}$ and $W={8\ {\rm ft}}$ is .