The Circumference of a Circle
Remember that circumference is just the name for perimeter that is used
with circles. You can use the diameter or the radius to find the circumference
of a circle by using either of these formulas:
Circumference =πd or 2 πr
A
B
7 in.
C = 2πr
C = 2 π 7 inches
C = 14π inches
501 Geometry Questions