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subtract the two sides that you know from the perimeter to get the unknown side.
ntuple
n-tuple?? or Richard
NTUPLE THIS WAS THE ANSWER GIVEN IN A 2008 NY TIMES CROSSWORD PUZZLE
Divide the length of the diagonal of a square by 1.4142 (which is the square root of 2) to find the length of a side. Similarly, to find the length of the diagonal of a square, multiply the length of a side by 1.4142.