The width times pi equals the circumference.
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If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)
Times length times width
You cannot since there is not sufficient information.
Think of slitting the cylinder down one side, then unroll it and lay it down flat. What you have then is a rectangle. The area of the rectangle is: (length x width). The length of the rectangle used to be the length of the cylinder, and the width of the rectangle used to be the circumference of the circle at the end of the cylinder, which is (pi) x (diameter of the cylinder), or (pi) x (double the radius of the cylinder). We're sure you can do it now.
-- Slice it down one side and flatten it out. -- Now you have a rectangle. You only have to find the area of a rectangle. -- The area of a rectangle is (length) times (width). -- The length of the rectangle used to be the length of the cylinder. -- The width of the rectangle used to be the circumference of the cylinder's round ends, while it was still rolled up.