Parabola Foci Properties
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The segments between the point of intersection of two tangents to a conic and their points of contact are seen from a focus under equal angles. the ratio of the distances of any point on a conic from a focus and the corresponding directrix is constant.
Keywords
conic, conic section, parabola, hyperbola, focus, tangent, Segment, corresponding, intersection, foci, directrixGalleries
Conic Sections: ParabolasSource
Encyclopaedia Britannica (New York: The Encyclopaedia Britannica Company, 1910) 11:703
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