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双曲线的切线定理求纯几何证明

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hjfmhh Posted 2017-7-22 16:43 |Read mode

9{PC43B2ON3KHQ07JTM]2U5.png

双曲线上任意一点（异于顶点）处的切线，平分该点处两条焦半径的夹角

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isee Posted 2017-7-22 17:39

双曲线的光学性质
从双曲线一个焦点发出的光，经过双曲线反射后，反射光线的反向延长线都汇聚到双曲线的另一个焦点上

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