| 单词 | conic section |
| 释义 | > as lemmasconic section conic section n. a figure formed by the section of a right circular cone by a plane; a plane curve of the second degree. If the inclination of the cutting plane to the axis of the cone be greater than that of the edge of the cone, the section is an ellipse n. (with the circle as a particular case when the plane is perpendicular to the axis; if less, a hyperbola n.; if the plane be parallel to the edge, a parabola n. (The pair of intersecting straight lines formed by a section through the vertex—strictly a particular case of the hyperbola—is not usually reckoned as a conic section.)extracted from conicadj.n.< as lemmas |
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