A diameter is a property of circular objects. "12 inches" is not a circular object and so cannot have a diameter.
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Multiply the diameter by Pi - in which case it's 37.699 inches.
Circumference = 37.7 inches Diameter = 12 inches
The area of a circle with a diameter of 12 inches is: 113.1 square inches.
The volume of a cylinder with a height of 15 inches by 12 inches in diameter is: 1,700 cubic inches.
12/pi inches, about 3.5 inches