如图所示,过圆O外一点M作它的一条切线,切点为A,过A点作直线AP垂直于直线OM,垂足为P.N为线段AP上一点,直线NB垂直于直线ON,且交圆O于B点.过B点的切线交直线ON于K.证明:∠OKM=90°.要求每一步都给
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![如图所示,过圆O外一点M作它的一条切线,切点为A,过A点作直线AP垂直于直线OM,垂足为P.N为线段AP上一点,直线NB垂直于直线ON,且交圆O于B点.过B点的切线交直线ON于K.证明:∠OKM=90°.要求每一步都给](/uploads/image/z/10427346-18-6.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E8%BF%87%E5%9C%86O%E5%A4%96%E4%B8%80%E7%82%B9M%E4%BD%9C%E5%AE%83%E7%9A%84%E4%B8%80%E6%9D%A1%E5%88%87%E7%BA%BF%2C%E5%88%87%E7%82%B9%E4%B8%BAA%2C%E8%BF%87A%E7%82%B9%E4%BD%9C%E7%9B%B4%E7%BA%BFAP%E5%9E%82%E7%9B%B4%E4%BA%8E%E7%9B%B4%E7%BA%BFOM%2C%E5%9E%82%E8%B6%B3%E4%B8%BAP.N%E4%B8%BA%E7%BA%BF%E6%AE%B5AP%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E7%9B%B4%E7%BA%BFNB%E5%9E%82%E7%9B%B4%E4%BA%8E%E7%9B%B4%E7%BA%BFON%2C%E4%B8%94%E4%BA%A4%E5%9C%86O%E4%BA%8EB%E7%82%B9.%E8%BF%87B%E7%82%B9%E7%9A%84%E5%88%87%E7%BA%BF%E4%BA%A4%E7%9B%B4%E7%BA%BFON%E4%BA%8EK.%E8%AF%81%E6%98%8E%EF%BC%9A%E2%88%A0OKM%3D90%C2%B0.%E8%A6%81%E6%B1%82%E6%AF%8F%E4%B8%80%E6%AD%A5%E9%83%BD%E7%BB%99)
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