The area of a square with sides of length x units is x2 square units.
So x2 = 81 which implies that x = 9.
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-- 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] .
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.
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...)
For a square, length of side = sqrt(Area) = sqrt(25) = 5 metres.
Area is usually length times width. In a square the length and width are the same, so the area is one side squared. It's where the word came from.