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 Math Help > Geometry > Circles, Conic Sections

### Contents of this section:

A conic section is the intersection of a plane with a cone. can be defined: as the locus of all points P, such that the ratio of the distance from P to a fixed point (the focus), to the distance from P to a fixed line (the directrix), is constant. The value of this constant is known as the eccentricity, e.

In the Conic Sections page, we will explore the general form of a conic section as well as identifying the types of conic section: ellipse, hyperbola, and parabola.

Eq of Circle given 3 points explains how to find the equation of a circle if the only thing you know about the circle is three points it passes through.

Continue reading with the next page: Conic Sections

### Related pages in this website

Cyclic Quadrilaterals is a section all about polygons inscribed in or circumscribed about circles and other conic sections

The quadratic formula describes the Vertex Form of a parabola, its directrix and focus

The webmaster and author of this Math Help site is Graeme McRae.