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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

Common Tangent

two or more circle that share same tangent line

Congruent Circles

circles that have congruent radii

Concentric Circles

circles that lie in same plane & have same center point

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