| 单词 | ellipse |
| 释义 | ellipse /i lips"/, n. Geom. a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. Typical equation: (x2/a2) + (y2/b2) = 1. If a = b the ellipse is a circle. See diag. under conic section. [1745-55; < F < L ellipsis ELLIPSIS; or by back formation from the pl. ELLIPSES] |
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