There are two common formulas for the circumference of a circle:
1. C = 2Ï€r, where C is the circumference, and r is the radius of the circle.
2. C = πd, where C is the circumference, and d is the diameter of the circle (which is equal to twice the radius).
What is the formula for circumference of a circle?
(hint: there is more than one right answer)
1 answer