d divide by 2 in wich d is diameter
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it would be pi * radius squared
The radius of a circle is half of the diameter! So, if the diameter was four inches, the radius would be two inches!
The radius of the cylinder would be 0.64cm ! The radius is half the diameter - length has nothing to do with the question !
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
you double the radius to find the diameter.