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5 cm + 5 cm + 5 cm + 5 cm or 10 cm + 10 cm
Four measurements
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 =)
The radius is 5 cm.
It is: 10*5*5 = 250 cubic cm