The diagonal of a 101 inch square is about 142.84 inches.
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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
A 12" x 12" square has a diagonal measurement of: 16.97 inches.
The diagonal of a square is not perpendicular to its side. The diagonal of a square will separate the square into two triangles. The diagonal goes from one corner to the opposite corner. Because it is a square, the diagonal and a side of the square will always form a 45-degree angle.
Not always, the diagonal can be figured out using the Pythagorean Theorem (a²+b²=c²). Where the diagonal is the hypotenuse (c). By rearranging the Pythagorean Theorem, you can see that the diagonal of a square is always 1.4 times the side of the square.