Circumference of a circle = 2*pi*radius or diameter*pi
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Its circumference is: 15*pi cm Its area is: pi*7.5^2 square cm
A circle with a radius (d/2) of 15 cm has a circumference of 94.2 cm
circumference = 15*pi cm
The diameter of a circle with a circumference of 15 centimeters is about 4.775 cm
It is 15*pi = 47.1 cm, approx.