If the curved surface area of a cylinder is 440 cm² and the height of the cylinder is 10 cm, then what is its radius (in cm)?

The curved surface area of a cylinder is found by the formula 2 times pi times r times h, which equals 440. Substituting the height h as 10 cm gives 2 times pi times r times 10 equals 440. Solving for the radius r yields r equals 440 divided by 20 times pi, resulting in 7 cm.

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