any point on a circle and the circle's center
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It is perpendicular.
A chord or its radius
if you mean the point that starts at the edge of the circle and ends in the center then this is the radius (:
A radius; considering a sphere is a 3-D version of a circle.
A parabola has no endpoints: it extends to infinity.A parabola has no endpoints: it extends to infinity.A parabola has no endpoints: it extends to infinity.A parabola has no endpoints: it extends to infinity.