conic section
The Columbia Encyclopedia, Sixth Edition | Date: 2008
conic section or conic , curve formed by the intersection of a plane and a right circular cone (conical surface). The ordinary conic sections are the circle , the ellipse , the parabola , and the hyperbola . When the plane passes through the vertex of the cone, the result is a point, a straight line, or a pair of intersecting straight lines; these are called degenerate conic sections. There are many examples of the conic sections, both in nature and in technology. The orbits of planets and satellites are elliptical, and parallel reflectors (e.g., in telescopes) are parabolic in shape.
Author not available, CONIC SECTION.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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ellipse Conic section formed by cutting a right circular cone with a plane inclined at ... the cone. When the intersecting plane is parallel to the base, the conic section is a circle. In rectangular Cartesian coordinates its standard equation ...
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