Perimeter of a square = 4 x side units
Side = 19 cm
So, Perimeter = 4 x 19 cm = 76 cm
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Perimeter of square: 19+19+19+19 = 76 cm
Perimeter of the square: 17+17+17+17 = 68 cm
200 cm
Perimeter = 4*23 = 92 cm providing the sides are 23 cm
Assuming by "equal" you mean that each side is 5 cm, then the perimeter of a square is 5 cm * 4 (sides) = 5 cm + 5 cm + 5 cm + 5 cm = 20 cm The perimeter of any polygon is the sum of the sides Alternatively if by "equal" you mean the sides sum to 5 cm, then the perimeter is 5 cm. Although this is probably not what you meant =)