you get a ruler and mesur it from one side to the other. :)
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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.
A square with a side length of 15 meters has an area of 225 square meters.
The area of a square is (the side length)2.That means (the side length) times (the side length).If you multiply 15 by 15, that will get you close.
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.