Most recent change of ConicSection

Edit made on November 17, 2008 by derekcouzens at 20:11:06

Deleted text in red / Inserted text in green

WW
HEADERS_END
A conic section is the curve obtained by the intersection of a plane and a cone (a conic surface).

These are:
* circle - cutting perpendicular to the centre line
* ellipse - cutting at an angle between the centre line and the slope angle.
* parabola - cutting parallel to one edge
* hyperbola - cutting parallel to the centre line
* circle - cutting perpendicular to the axis of symmetry of the cone
* ellipse - cutting at an angle less than the slope angle.
* parabola - cutting at an angle equal to the slope angle
* hyperbola - cutting at an angle greater than the slope angle

| http://upload.wikimedia.org/wikipedia/commons/9/97/Conic_section_(PSF).png |
| |>> Image courtesy of the wiki commons. <<| |

There are some degenerate cases:
* point - a degenerate circle
There are some degenerate cases i.e. when the cutting plane passes through the apex of the cone:
* point - a degenerate circle (or ellipse)
* line - a degenerate parabola
* intersecting lines - a degenerate hyperbola