Eccentricity (Mathematics)

• The eccentricity of a circle is zero.
• The eccentricity of an ellipse is greater than zero and less than 1.
• The eccentricity of a parabola is 1.
• The eccentricity of a hyperbola is greater than 1.
• The eccentricity of a straight line is infinity.

Ellipse

$e\; =\; \backslash sqrt\{1-\backslash frac\{b^2\}\{a^2\}\}.$

Hyperbola

$e\; =\; \backslash sqrt\{1+\backslash frac\{b^2\}\{a^2\}\}.$

External links

• MathWorld: Eccentricity

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