The circumference.
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The circumference of an object - particularly a circle - is the distance around the outside of it.
A radius of a circle is a line segment joining the center of the circle to a point on the circle. All such segments have the same length, and this length also called the radius of the circle.
Circumference of a circle = 2*pi*radius or pi*diameter
The distance from a circle to its center (the dot in the middle) is called 'the radius'. The distance from a circle to a point opposite is called 'the diameter'. The diameter is twice the length of the radius.
The width, or the length of a circle are its diameter.