1/2 diameter or the circumference/pi/2
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diameter/2
Volume = 4/3 * pi * radius * radius * radius Surface Area = 4 * pi * radius * radius
Because when working out volumes the answer is given in cubic units and the radius in the formula for finding the volume of a sphere is cubed: Volume of a sphere in cubic units = 4/3*pi*radius3
Volume of a sphere = (4/3) x (pi) x (Radius)3
The formula for the volume of any sphere isVolume = ( 4/3 pi ) x (cube of the radius)