The formula for the circumference of a circle is C = πd,
π = 3.142, d = 4cm
C = 3.142 x 4cm
C = 12.568cm
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The circumference of a circle is (diameter) multiplied by (pi).
pi times diameter
Circumference = Pi X Diameter = 3.1415 X 4cm = 12.566cm
Circumference of a circle = pi*diameter Circumference = 50.26548246 or 50 to the nearest inch
Circumference = pi*diameter = 21.99 inches, approx.