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Discuz Math Forum»Forum › Mathematics › High School › 内接圆与外接圆半径之比
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[几何] 内接圆与外接圆半径之比

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tommywong

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tommywong posted 2014-5-5 22:11 |Read mode
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设r与R分别为三角形ABC的内接圆与外接圆半径，而且∠A为三角形ABC中最大的角，M为BC的中点，X为外接圆在三角形ABC的B和C二点上的切线的交点，证明：

$\displaystyle\frac{r}{R}\ge\frac{AM}{AX}$
现充已死，エロ当立。
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