How do you easily find the circumference of a circle?

Answer 1

d=diameter

r= radius

c=circumference

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Radius is half of Diameter, therefore you would multiply Diameter by Pi.

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You can also find the circumference by doing radius times 2 times Pi. So the formula for circumference is r*2*pi or radius times 2 times Pi

-richlee2000

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The proper answer, to all those who see this is as follows:

2rπ

r = radius

π = I hope your joking... But 3.14or pi.

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Circumference of a circle is simply pi times the diameter, or 2pi times the radius. Proving this requires some introductory calculus though.

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pi times the diameter. That's it, that's the circumference. If you only have the radius, you need to GET the diameter by multiplying the radius by 2. Hence 2rpi

2xr = diameter

diamater x pi = circumference

2rpi
if the object is a circle or sphere, the cirsunmference is pi (3.1415927) multiplied by the diameter(distance across circle through center point) voila!