C = 2 * pi * r
C is the circumference of the circle;
pi is approximately 3.1416;
r is the radius of the circle;
2r is the diameter, so C = d * pi as well.
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The formula for the circumference of a circle is: Circumference = πdiameter OR (π)2radius
The equation for the circumference of a circle is pi times radius squared.
the equation for the circumference is Pi * double the radius which is 3.1416 * 15.5 * 2 The circumference of a circle with a radius of 15.5cm is 97.3cm.
Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)
Yes it is, because both of them are just the distance around the circle, the equation forthe circumference is pi x Diameter.
Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.