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[几何] 作两条二次曲线的公切线

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hbghlyj Posted at 2024-3-13 06:00:58 |Read mode
Last edited by hbghlyj at 2024-12-29 10:15:00可以下载Cinderella软件打开 $type IntersectingConicsTangencies.cdy (88.08 KB, Downloads: 30) 文件。
展开 Views 菜单,选择 Construction text 可以显示作图步骤。
ThNapiJj[1].png
为什么该方法可以构造两条二次曲线的公切线

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 Author| hbghlyj Posted at 2024-12-29 13:10:35
网页 与 4 条线相切的圆锥曲线 可能会有所帮助

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 Author| hbghlyj Posted at 2024-12-29 16:14:46
唉还是不会。发到math.stackexchange.com/questions/5016956/ 问一问

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 Author| hbghlyj Posted at 2024-12-29 18:07:09
John Milne 1911年出版的《An elementary treatise on cross-ratio geometry
Chapter XV, Article 245(1)
elementarytreati00milnuoft_0254.jpg elementarytreati00milnuoft_0255.jpg

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