Circumference of a circle = 2*pi*radius or diameter*pi
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The circumference of a circle with a radius of 4cm is: 25.13 cm (r x 2 x pi)
Circumference = Pi X Diameter = 3.1415 X 4cm = 12.566cm
It is: 2 to 3 respectively
circumference of the circle = 4*pi cm
C = 12.6 cm