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If you're asking about a square with side length 21, the perimeter is 4 x 21 = 84 and the area is 212 = 441.
That is not a square.
Perimeter of a figure means the sum of the lengths of all the sides.A square has four sides, and in this case, the square's sides' lengths are 21 in.21 in. * 4 sides = 84 in.
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The perimeter of the square is 96.