Circumference of a Circle
The circumference of a circle is the total length of the boundary or perimeter of the circle. It is the distance you would travel if you were to walk around the circle.
Circumference of a Circle formula |
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\(\large{ C = 2 \; \pi \; r }\) (Circumference of a Circle) \(\large{ r = \frac{C}{2 \; \pi} }\) |
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Solve for C
Solve for r
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| Symbol | English | Metric |
| \(\large{ C }\) = circumference | \(\large{ in }\) | \(\large{mm }\) |
| \(\large{ \pi }\) = Pi | \(\large{3.141 592 653 ...}\) | |
| \(\large{ r }\) = radius | \(\large{ in }\) | \(\large{mm }\) |
