find the diameter or radius and for the diameter use this equation: d x pi or d x 3.14 and if you want to find the circumference from the radius use this: r x 2 x pi or r x 2 x 3.14. hope i helped :D
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You multiply the diameter by pi, (Approximately 3.14159), so C=pi D.
The circumference of a circle can be found using the equation c=2πr. For example, if a circle has a radius of 10, its circumference is 20π, or 62.832.
Circumfrence=diameter X 3.14 (diameter=2 X radius)
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
Wow, a question I actually know! The radius of a circle is 1/2 of the circumfrence. In other words, if your body was a circle, and you spread out youre arms, the area from you're heart to the tip of you're fingers would be the radius.