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We can use the following formula to solve this. A^2 + B^2 = c^2
A and B will be the sides of the rectangle. Plug in the numbers.
12^2 + 5^2= C^2 This can be rewritten as:
144+ 25 = C^2
169 = C^2 Square root both sides will give us:
C = 13
There we go the length of the diagonal is is 13 feet long.
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