find the circumference of the circle and multiply it by the height of the cylinder
you divide the surface area by the circumference.
The width times pi equals the circumference.
Use: 2*pi*radius = circumference
Divide the circumference by the value Pi - this will give you the diameter.
Entire surface area of a cylinder = (2*pi*radius^2)+(circumference*height) If you are given the circumference then radius = circumference/2*pi
C = 2 pi r
Find the radius by dividing the circumference by 2pi then find the area of the base and multiply it by the height
Take the circumference and multiply it by it's height to get the lateral surface area.
C = 2pi * r
You just need to find the circumference of the circular base (or top). It's the same thing. (Hint: use C=pi*diameter to find the circumference).
divide the circumference by pi (3.1416) and divide the product by two that will give you the radius