For example, a circular disk is convex, as is a solid sphere, or a solid cube. A torus is not convex, however, since the line segment joining points on opposite sides of the "hole" is not entirely contained in the torus itself.

**See also:**

- Convex Hull
- Convex Envelope

* 8/12/94 dpvc@geom.umn.edu -- *

*The Geometry Center*