The Diameter is the distance from one side of the circle all the way to the other side.
The Radius is half the distance in a circle.
Simply put: 40cm = Diameter
20cm = Radius (Half the distance) :)
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40cm times 40cm times 40cm equals 64,000cm. The volume of the cube is 64,000cm cubed or 0.064m cubed.
40
The perimeter is 40cm
500mm is 25% bigger than 40cm.
40cm.