start
real length L and width w
calculate the area A= Lw
calculate the circumference C=2(L+w)
Display A and C
End
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-- 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.
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.
find the circumference of the circle and multiply it by the height of the cylinder
you divide the surface area by the circumference.
in order to find the area of a rectangle you must multiply the base of the rectangle by its height. This is also the same for most polygons