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.
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Circumcircle, the circumscribed circle of a triangle, which always exists for a given triangle.
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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.
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Cyclic quadrilateral, a special case of a cyclic polygon.
See also
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Smallest-circle problem, the related problem of finding the circle with minimal radius containing an arbitrary set of points, not necessarily passing through them.
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Inscribed figure
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