最終更新日:2024/06/27

In geometry, an ellipse is a closed plane curve obtained by the intersection of a cone and a plane.

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En g�om�trie, une ellipse est une courbe plane ferm�e obtenue par l'intersection d'un c�ne et d'un plan.

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In geometry, an ellipse is a closed plane curve obtained by the intersection of a cone and a plane.

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