Conic Sections - The Point
On an (x, y) graph a point has this shape:
If a plane intersects the cone when it is perpendicular to the axis and when it passes through the tip of the cone, the conic section is a point. Actually, in this discussion a point is a special case of a circle. This is shown below:
Here is a VRML world that shows how to form a point by intersecting a cone and a plane. (For help with VRML go here.)
(If you view the full screen version, use your browser's 'Back' button to return to this page.)