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7 foot circumference X 12 inches/foot = 84 inches in circumference
The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi
Diameter = 14 inches => circumference = pi*14 = 43.98 inches.
All depends what you mean by 18 inches, is that the circumference, the diameter or the radius
circumference = 2 times pi times r OR pi times d diameter = 60 inches pi = 2.1415927 circumference = 2.1415927 x 60 = 128.4956 inches (approximately 128 1/2 inches)