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Assuming you are talking about a rectangular area, the diagonal would be found using the Pythagorean Theorem. 5^2 + 10^2 = d^2, so 125 = d^2, then take square root of both sides.

This means the diagonal is approximately 11.18 feet. It is exactly 5√5 feet.

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Q: What is the diagonal of a 5 feet by 10 feet area?
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