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The formula for circumference of a circle
C = 2 · π · r
Description:
C – circumference of a circle
π – number pi = 3,1415
r – radius (distance from the center of the circle to a point on the circle)
Example:
Calculate the circumference of a circle with a radius of 4 cm.
C = 2 · π · r
C = 2 · 3,1415· 4 cm
C = 25,132 cm
The formula for circumference of a circle
C = π · d
Description:
C – circumference of a circle
π – number pi = 3,1415
d – diameter of a circle
Example:
Calculate the circumference of a circle with a diameter 9 cm.
C = π · d
C = 3,1415· 9 cm
C = 28,2735 cm
Circumference Calculator