# Conic Section

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A conic section is a curve obtained by intersecting a cone (more precisely, a circular conical surface) with a plane. The three type of conics are the hyperbola, ellipse, and parabola. (The circle is a special case of the ellipse, and there are degenerate cases like a pair of intersecting lines, a point, a double line, etc.) In polar coordinates, a conic section with one focus at the origin and the other focus (if any) on the axis, is given by the equation

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Contributed by: Roberto Contrisciani (March 2011)

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