Measure it.
Or take a quarter of its perimeter.
Or take the square root of its area.
Or take the cube root of a cube built on the square
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All four sides of a square are of equal length. To find the area, you square the length of one side. To find the length of one side from the given area, find the square root of the area. In this case, the square root of 25 is 5. Hence, the length of a side is 5 yards.
The square root of what? If you take the square root of the area, the answer will be the length of the side. If the area is, for example, in square meters, the length of a side will be in meters.
-- The perimeter of the square is [4 times the length of one side] . -- The length of one side of the square is [square root of its area] .
The new square has an area of 121, so the length of a side is the square root of 121, or 11. So the length of the side of the old square was 10.
To find the area of a square, where all four sides are of equal length, you simply square the length of one side: for example, the area of a square of four inches is sixteen square inches, or 42 in. To find the length of the side of a square when you only know the area, you simply reverse the process, and take the square root of the area. The square root of 16 is four, for example.