the set of coplanar points equidistant from a given point
the distance from the center point
segment who endpoints lie on a circle
a chord that contains the center of the circle
a line that intersects a circle in two points
in a plan, a line that intersects a circle at exactly one point
Point of Tangency
the point where the tangent line intersects the circle
two or more circle that share same tangent line
circles that have congruent radii
circles that lie in same plane & have same center point
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