How do you calculate the diagonal length of a rectangle?

The rectangle is 14' x 16'. What is the formula used to find the diagonal length?
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1 Answer

diagonal=root(leng*leng + wide*wide)

=root(16*16 +14*14)

=root(256 + 196)

=root(452)

=21.260291k63

or bout 21.26
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