circumference is 2 times pi times radius
area is pi times readius squared
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A circle is two dimensional.
The line passing through the center of a circle with two endpoints on the circle is the circle's diameter.
The duration of Circle of Two is 1.77 hours.
A part of a circle between two points on a circle is called is called an arc.
The sum of two radii of a circle is the same as the diameter of the circle.