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Circumscribed circle
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In geometry, a '''circumscribed circle''' for a set of points is a circle passing through each of them. Such a circle is said to ''circumscribe'' the points or a polygon formed from them; such a polygon is said to be ''inscribed'' in the circle. * [[Circumcircle]], the circumscribed circle of a triangle, which always exists for a given triangle. * [[Cyclic polygon]], a general polygon that can be circumscribed by a circle. The vertices of this polygon are [[concyclic points]]. All triangles are cyclic polygons. * [[Cyclic quadrilateral]], a special case of a cyclic polygon.
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