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A circle with a radius of 2.8 centimeters has a circumference of 17.59 centimeters.
50 centimeters
For a radius of 5 centimeters the area are 78.53981633974483 square centimeters.
Radius = 1/2 of diameter = 19 centimeters.
Length of a radius is always half the diameter of a circle. This means that the circle has a radius of 2cm.