Last Updated
：2025/11/20
ellipse
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（ plural ）
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(geometry) A closed curve, the locus of a point such that the sum of the distances from that point to two other fixed points (called the foci of the ellipse) is constant; equivalently, the conic section that is the intersection of a cone with a plane that does not intersect the base of the cone.
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ellipse
The mathematician traced an ellipse on the paper to illustrate how the sum of distances to the foci remains constant.
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The mathematician traced an ellipse on the paper to illustrate how the sum of distances to the foci remains constant.
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