The diagonal of an 18 inch square is about 25.46 inches. (18 times the square root of 2).
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The diagonal of a 101 inch square is about 142.84 inches.
Use Pythagoras' theorem to find the length of the diagonal in the square
18 ft Diagonal of a square is the square root of 2, times the side.
A 12" x 12" square has a diagonal measurement of: 16.97 inches.
Use Pythagoras' therom: 32+32 = 18 The square root of 18 is 4.242640687 units which is the length of the diagonal.