For a circle the diameter can be found by dividing the circumference by pi. Once the diameter is found by squaring the radius multiplied by pi.
For a cylinder follow the previous method and multiply the answer by two. Multiply the circumference of the circle by the cylinder height. Add the two answers together.
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S = C2/pi where S is the surface area, C is the circumference.
Entire surface area of a cylinder = (2*pi*radius^2)+(circumference*height) If you are given the circumference then radius = circumference/2*pi
you divide the surface area by the circumference.
Divide the surface area by the circumference of the circle, which is a product of the diameter x Pi. Essentially, an unrolled cylinder is a rectangle.
Square root (Area/pi) to get the radius Then 2xRadiusxPi= Circumference