2*pi*radius of the circle
or
diameter*pi where pi = 3.1416 or 22/7
and is usually rounded to 3.14.
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Well, the equation for finding the circumfrence of a circle is (diameter)(pi). That is diameter times pi. since the diameter of a circle is 2 radii, we can say that there is 2(pi) radii in a circle.
The 3 times circle rule is a rule for finding the circumfrence of a circle. Basiclly, you multiply the diameter by 3.
18.84
The circumference of a circle is (diameter) multiplied by (pi).
the radius squared x pi