If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .
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any circles circumference divided by its diameter will equal pi, or 3.14159 approximately
Pi and the radius can be used to find the area (PiR^2) or the circumference (2RPi) of a circle, where R is the radius.
Circumference of a circle is 2 x Pi x the radius
Radius is the distance from the center point to the edge of the circle. Diameter is the distance straight through the center point and across the circle. Circumference is the distance one full turn around the circle. Radius = 1/2 of the diameter Radius = (circumference) divided by (2 pi) Diameter = 2 times the radius Diameter = (circumference) divided by (pi) Circumference = (pi) times the diameter Circumference = (2 pi) times the radius