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公切線
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公切線
gōng qiē xiàn
和两个圆都相切的直线。两个圆在公切线同旁时,称为外公切线;两个圆在公切线两旁时,称为内公切线。公切线上两个切点之间的距离称为公切线的长。如果两圆有两条外公切线或内公切线,那么外公切线的长或公切线的长相等。数学上指二或二以上的曲线或曲面所共有的切线,或二圆所共有的切线。
公切线
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更新时间:2026/10/29 21:51:24