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You can't.

Suppose for instance your rectangle is 1xA, then the diagonal length is sqrt(1+A**2). But if your rectangle is sqrt(A)xsqrt(A) then your diagonal length is sqrt(2*A).

The only thing one can say for sure is that the diagonal length is at least sqrt(2*A).

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Q: How do you find the length of rectangle diagonally by using the area given?
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