It is half the thickness (diameter) of the circular cross-section of the cylinder.
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The radius of a cylinder is half the thickness of its circular cross section.
Pi * Radius * Radius * Height.
Oblong describes a plane figure that is different from a circle because it is elongated in one direction, while the radius of a circle is the same in all directions.
The answer will depend on whether the larger cylinder is 4 times larger in terms of radius, cross-sectional area, or volume. If radius, multiply the smaller radius by 4. If cross-sectional area, multiply the smaller radius by 2. If volume, you do not have enough information.
The volume of a cylinder that has a radius of 3cm and a height of 7cm is 197.92cm3