The circumcircle is a triangle's circumscribed circle, i.e., the unique circle that passes through each of the triangle's three vertices. The center O of the circumcircle is called the circumcenter, and the circle's radius R is called the circumradius. A triangle's three perpendicular bisectors M_A, M_B, and M_C meet at O. The Steiner point S and Tarry point T lie on the circumcircle. A circumcircle of a polygon is the two-dimensional case of a circumsphere of a solid.
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