find the circumference of the circle and multiply it by the height of the cylinder
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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.
the length of a rectangle is 8 more than the width. the area os 345 centimeters. find the length and width of the rectangle
Area of rectangle divided by its length = width of rectangle
You cannot find the area of a rectangle if you only know its length. You need to know its width too. Then you multiply its length by its width.
First of all, find the area of the circle on top of the cylinder, using the formula... pi x radius^2 ... Multiply that by two because there are two circles on the cylinder. Then find the area of the rest of the cylinder, which is basically a rectangle. So, get the height, and multiply it by the circumference of the circle (also the length of one side of the rectangle) using the formula ... pi x diameter ...