Use Pythagoras. The diagonal, and two sides of the square form a right angled triangle. So if each side of the square is x cm long, the diagonal is x*sqrt(2) cm long.
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Use Pythagoras' theorem to find the length of the diagonal in the square
You multiply the length of a side by the square root of 2.If you only have the area, square root it to find the length of a side.
To find the area of a square with a diagonal of 14, we first need to determine the length of one side of the square. Using the Pythagorean theorem, we can calculate that the side length is 7√2. Then, we can find the area of the square by squaring the side length, which gives us 98 square units.
The answer will depend on what information about the square you have: its perimeter, area, length of diagonal.
Each side is sqrt 72 ie 8.49 in