单词	conic section
释义	conic section noun 1 : a plane curve, line, pair of intersecting lines, or point that is the intersection of or bounds the intersection of a plane and a cone with two nappes 2 : a curve generated by a point which always moves so that the ratio of its distance from a fixed point to its distance from a fixed line is constant Illustration of conic section 1 straight lines 2 circle 3 ellipse 4 parabola 5 hyperbola Example Sentences Recent Examples on the Web Given one rational point P on such a graph, there is an elegant way to find all the other rational points: Simply take each line that passes through P with a rational slope, and calculate the line’s second intersection point with the conic section. Quanta Magazine, 9 July 2013 The graphs of such curves are the conic sections — circles, parabolas, ellipses and hyperbolas. Quanta Magazine, 9 July 2013 Word History First Known Use 1664, in the meaning defined at sense 1
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