A = C^2/(4 pi)
The area of the circle is...
The circumference squared...
divided by 4...
divided by pi
If you already know the area, then you can multiply it by 4*pi, and then the square root of the product is equal to the circumference!
C = (A*(4 pi))^(1/2)
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Square root (Area/pi) to get the radius Then 2xRadiusxPi= Circumference
Radius = square root of (area/pi) Circumference = 2*pi*radius
Entire surface area of a cylinder = (2*pi*radius^2)+(circumference*height) If you are given the circumference then radius = circumference/2*pi
S = C2/pi where S is the surface area, C is the circumference.
Times length times width