A rhombus
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Each side is 20 inches. 20 x 20 = 400 square inches.
As the area of a square is the length of one side squared, take the square root of 2401 to get one side's length. The perimeter is 4 times the length of one side.
the perimeter of a square is 4 x length of one side or side = 70cm/4 = 17.5cm
It is: perimeter/4 = length of one side of the square
Multiply (the length of one side) by (the length of one side).