A square has all 4 sides equal in length. A four sided closed figure with all sides different length is called a quadrilateral.
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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.
A SCALENE triangle has all three sides different lengths.
Add up the lengths of all the sides.
not all sides are equal and are different lengths
A rectangle has lengths different from the widths. (12" x 8" is a rectangle). A square has all sides of equal length. (7" x 7" is a square).