Not sure about crircumference, but radius = circumference/(2*pi)
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Double the Radius to Calculate the Diameter.
From what? You need other variables you can use in the standard circle formulae from which to calculate the radius.
The radius is one -half of the diameter. It is the distance from the circle center to any point on the circumference.
you calculate the Area of the circle at the end of the Cylinder and then multiply it by the lenght to the second circle at the end of the cylinder Circle area= Radius*Radius* pi pi being 3.14159265
Circumference of a circle = 2*pi*radius or pi*diameter