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A circle 14 inches in diameter has a radius of 7 inches, and a circle having a radius of 7 inches has a diameter of 14 inches.
A cylinder with a radius of 7 inches and a height of 48 inches has a volume of 7,389.03 cubic inches.
7 inches, radius+1in=diameter. Always.
Radius = 1/2 of diameter = 7/2 = 3.5 inches
The surface area of a cylinder with height of 12 inches and 7 inch radius is 835.66 square inches