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[几何] 直线与圆

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guanmo1 Posted 2015-3-4 09:22 |Read mode

如图

直线与圆.png

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kuing Posted 2015-3-4 12:46

由图知无解

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Author| guanmo1 Posted 2015-3-4 13:58

回复 2# kuing

怪不得，PA=AB，打错了。

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kuing Posted 2015-3-4 14:10

回复 3# guanmo1

PA=AB 的话，大概就是这个范围：
QQ截图20150304141214.gif

QQ截图20150304141214.gif

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isee Posted 2015-3-4 14:17

回复 2# kuing

原题中圆与y轴相切，动点在y轴上，自然无解了。

改了后，直接切割线定理

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