side of a square is diagonal / 21/2
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Take the square of the side.Take the square of the side.Take the square of the side.Take the square of the side.
Area of square= side*sideIf you mean by "length of the square" one side of the square, then the area is 16 cm^2 (If you mean by "length of the square" it's perimeter, then you have to get it'a side from that data:Perimeter of squre=4*side -> side = (Perimeter of square)/4 then you get one side and you can calculate the area from that...)
Length of Side*Length of Side (in square units).
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 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.