A circle is a plane figure consisting of a curve in which every point is equidistant from a fixed point called the center.
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A chord is the part of a circle defined by two endpoints.
No. Unless the centrepoint of a circle is defined as a point of a circle.
A circle has neither mass not volume so its density is not defined.
If the radius is two. it won't be a unit circle, a unit circle is defined as a circle with radius one.
In the context of a circle or the coordinate plane, quadrants are the four quarters defined either by two mutually perpendicular radii or the coordinate axes.