The formula for the circumference of a circle is:
C=2πrC=2\pi rC=2πr
where:
- CCC is the circumference
- π\pi π (pi) is approximately 3.14159
- rrr is the radius of the circle
Alternatively, if you know the diameter ddd (which is twice the radius), the formula is:
C=πdC=\pi dC=πd
Let me know if you'd like an explanation or examples!
