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If the area of the square is 64 square cm then its sides are 8 cm. Its perimeter: 8+8+8+8 = 32 cm
The perimeter of any polygon is the sum of the lengths of all the sides. Specifically in the case of a square, since it has 4 sides of equal length, the perimeter is simply 4 times the length of any side.
Perimeter = sum of the sides An octogan has 8 sides P = 32 cm x 8 Sides P = 256 cm
Perimeter = 8*15 = 120 cm
A pentagon has 5 sides. In a regular pentagon, all 5 sides are equal length, so the perimeter = 5 x 8 cm = 40 cm