eccentric angle

For ellipses, angle A {eccentric angle} in equations x = a * cos(A) and y = b * sin(A), where a is ellipse major axis, and b is ellipse minor axis, determines eccentricity. Hyperbola has eccentric angle A with x = a * sec(A) and y = b * tan(A).

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Mathematical Sciences>Geometry>Solid>Cone>Conic Section>Eccentricity

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