Tina curled an 8 inch by 10 inch rectangular piece of paper along one of its sides to form an open cylinder with a height of 10 inches. Which measure of the cylinder will be 8 inches?

The 10-inch side becomes the cylinder’s height, so the 8-inch side is curled around to form the circular base. The length wrapped around the base is its circumference, so the circumference is 8 inches. The radius, diameter, and area are not directly equal to the wrapped side length.

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