18 feet.
Taking the width to mean the diameter, the answer is 69/2 = 34.5 feet
The "diameter" is the maximum width of a circle. It is not a fixed unit of length.
The surface area of a sphere with a diameter of 18 feet is: 1,020 square feet.
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !
Area = Length * Width= 18 * 18 = 324 Square Feet
Diameter = 18/pi = 5.73 feet, approx.
An 18-foot diameter measures 18 feet across the widest part of a circle. The diameter itself is already expressed in feet, so it remains 18 feet. If you need to convert it to other units, 18 feet is equivalent to 216 inches or approximately 5.49 meters.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
If the width is 9' and the length is twice that, the length is 18'; the perimeter is twice the length plus twice the width, which is 36' + 18' = 54 feet.
Diameter = 56.52/pi = 17.99087477 or about 18 feet
Diameter is twice the radius, so 18 feet.
When you say width, I think you mean diameter 14 = pi x diameter diameter = 14/pi = 14/3.1415 = 4.456 feet