Illustration of a cyclic quadrilateral, a quadrilateral inscribed in a circle. This can also be described as a circle circumscribed about a quadrilateral. In this illustration, the quadrilateral is not regular (the lengths of the sides are not equal).
circle, circles, circumscribe, circumscribed, cyclic polygon, cyclic quadrilateral, externally, geometric shape, inscribe, inscribed, internally, quadrilateral, quadrilaterals, shapes, tangency, tangent
Florida Center for Instructional Technology Clipart ETC (Tampa: University of South Florida, 2007)