False If the diameter of a cylinder is 8 feet, then its radius is not 16 feet it is 4 feet.
What is a cylinder?
The surface traced by a straight line moving parallel to a fixed straight line and intersecting a fixed planar closed curve.
What is a diameter?
A straight line that runs from one side of a figure and passes through the center.
Diameter is always two times the radius.
If diameter is 8 feet then radius is 4 feet.
Thus the statement is false
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