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This is a good explanation about how to calculate the surface area of a cylinder. However, it assumes you know how to find the area of a circle and the area of a rectangle. If you don't, please review those concepts before watching this video.
Read about how to calculate the surface area of a cylinder, watch an animation, then try to figure out the surface area of the cylinder. You can keep trying with different sizes of cylinders - the interactive programme will let you know how you're doing!
Even if a cylinder looks tall, its circumference can often be larger than its height.
When you flatten out the surfaces of a cylinder, you get two circles and a rectangle.