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example: if a square is 3 inches on all sides you use the formula 'A squared+B squared=C squared' and plug in 3 for variables A and B.

3'2+3'2=c'2 so it equals 9+9=c2 so 18=c2 so square root of 18 is in between 4 and 5 but closer to 4 so its about 4.2 inches

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Q: How do you you figure the length diagonally across a square?
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