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[几何] 反速旋转的线的交点轨迹与圆恰有两个切点

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hbghlyj posted 2021-6-4 22:32 |Read mode
给定平面上两个相离的圆(O1,r1)和(O2,r2),它们的内公切线为L.
L1是圆O1的切线,L2是圆O2的切线,L1与L2不平行,L1与L的夹角等于L2与L的夹角.
L1与L2交于P,P的轨迹与圆(O1,r1)恰有两个切点,求O1,r1,O2,r2应满足的条件.

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original poster hbghlyj posted 2021-6-4 22:36
可能有1,2,3个切点

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