A 12" x 12" square has a diagonal measurement of: 16.97 inches.
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The diagonal of a 101 inch square is about 142.84 inches.
The diagonal of an 18 inch square is about 25.46 inches. (18 times the square root of 2).
Use Pythagoras' theorem to find the length of the diagonal in the square
Sq inch = width X height (as in how many SI in a window glass) UI = Width + height (this is a measurement often used for costing replacement window units instead of Sq")
1.7689