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 Description  
 Circumscribed:  A descriptor for a geometric figure that is drawn around and enclosing (while certain points are touching) another geometric figure.
A polygon is circumscribed about a circle if and only if each side of the polygon is tangent to (touches) the circle. In the figures below, a triangle, square, pentagon, and hexagon are each circumscribed about a circle. Notice for each circumscribed polygon, all the sides are tangent to the circle and the polygon lies entirely outside the circle.



A circle is circumscribed about a polygon if and only if all vertices of the polygon lie on the circle. The figures below show examples of circumscribed circles.



A polygon is circumscribed about another polygon if and only if all vertices of the inner polygon lie on the sides or the vertices of the outer polygon.