Definition:Concyclic Points

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Definition

A set of $4$ or more points $S = \set {P_1, P_2, \ldots, P_n}$ is concyclic if they all lie on the circumference of a circle.

Concyclic.png

In the above diagram, points $A, B, C, D$ are concyclic, as they all lie on the circumference of the circle centered at $O$.


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