A circle is a curve consisting of all those points of a plane that lie at a fixed distance
from a particular point in the plane, this point being the center.
The radius is the length of a line drawn from any point on the circle to the center
point. The diameter, which is twice the radius, is the length from one point on the
circle, through the center point, to another point on the circle.
A circle is a special case of an ellipse produced by a section
perpendicular (at right angles) to the axis.
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