Question

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A cylinder has a diameter of 40 feet and a height of 32 feet. What is the surface area of the cylinder? Express the answer in terms of pi.

Answer 1

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➷ The formula for surface area of a cylinder is:

$2\pi rh + 2\pi r^2$

The radius is half the diameter

radius = 40/2 = 20

Substitute the values in

Surface area = $2\pi (20)(32) + 2\pi (20)^2$

Simplify to get an answer of:

surface area = $2080\pi feet^2$

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