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In mathematics, the eccentricity (sometimes spelled "excentricity"), denoted ε (or, for basic text notation "e"), is a parameter associated with every conic section. It can be thought of as a measure of how much the conic section deviates from being circular. In particular, * The eccentricity of a circle is zero. * The eccentricity of an ellipse which is not a circle is greater than zero but less than 1. * The eccentricity of a parabola is 1. * The eccentricity of a hyperbola is greater than 1.

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  • Eccentricity
  • Eccentricity
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  • From Greek εκκεντρικός ekkentrikos, from εκ- ek "from" + κεντρικός kentrikos "of the center, central"
  • In mathematics, the eccentricity (sometimes spelled "excentricity"), denoted ε (or, for basic text notation "e"), is a parameter associated with every conic section. It can be thought of as a measure of how much the conic section deviates from being circular. In particular, * The eccentricity of a circle is zero. * The eccentricity of an ellipse which is not a circle is greater than zero but less than 1. * The eccentricity of a parabola is 1. * The eccentricity of a hyperbola is greater than 1.
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abstract
  • From Greek εκκεντρικός ekkentrikos, from εκ- ek "from" + κεντρικός kentrikos "of the center, central"
  • In mathematics, the eccentricity (sometimes spelled "excentricity"), denoted ε (or, for basic text notation "e"), is a parameter associated with every conic section. It can be thought of as a measure of how much the conic section deviates from being circular. In particular, * The eccentricity of a circle is zero. * The eccentricity of an ellipse which is not a circle is greater than zero but less than 1. * The eccentricity of a parabola is 1. * The eccentricity of a hyperbola is greater than 1. Furthermore, two conic sections are similar if and only if they have the same eccentricity.
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