Eccentricity of a Conic Section
A number that indicates how drawn out or attenuated a conic section is. Eccentricity is represented by the letter e (no relation to e = 2.718...). For horizontal ellipses and hyperbolas, eccentricity . For vertical ellipses and hyperbolas, eccentricity . Here, c = the distance from the center to a focus, a = the horizontal distance from the center to the vertex, and b = the vertical distance from the center to the vertex.
Interactive Feature
Conic Sections Defined by Eccentricity Java Sketchpad version (Java enabled browser required) Geometer's Sketchpad version (GSP 4 required) | Conic Sections Defined by Eccentricity |
See also
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