C = 2 pi (r) (two times pi times the radius of the circle)
OR
C = pi (d) (pi times the diameter of the circle).
Often, pi is rounded off to equal 3.14, so if your calculator does not have a pi button on it, then use 3.14.
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The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
Circle's circumference = 2*pi*radius or diameter*pi
to find the circumference of a circle you do 2 times3.14timesthe radius
circumference of a circle = pi * diameter.
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi