5 cm
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A circle with a radius of 2.8 centimeters has a circumference of 17.59 centimeters.
For a radius of 5 centimeters the area are 78.53981633974483 square centimeters.
A cylinder with a radius of 3 centimeters and a height of 12 centimeters has a volume of 339.29 cubic centimeters.
Radius = 1/2 of diameter = 19 centimeters.
The radius of a cylinder is independent of its height.