直线与圆:如图,BD 是⊙O的直径,OA⊥OB,M是劣弧AB上一点,过点M点作⊙O的切线MP交OA的延长线于P点,MD与OA交N点.(1)求证:PM=PN(2)若BD=4,PA=1.5AO,过点B作BC‖MP交⊙O于C点,求BC的长.分数不够可以说已上图
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![直线与圆:如图,BD 是⊙O的直径,OA⊥OB,M是劣弧AB上一点,过点M点作⊙O的切线MP交OA的延长线于P点,MD与OA交N点.(1)求证:PM=PN(2)若BD=4,PA=1.5AO,过点B作BC‖MP交⊙O于C点,求BC的长.分数不够可以说已上图](/uploads/image/z/8241201-9-1.jpg?t=%E7%9B%B4%E7%BA%BF%E4%B8%8E%E5%9C%86%3A%E5%A6%82%E5%9B%BE%2CBD+%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84%2COA%E2%8A%A5OB%2CM%E6%98%AF%E5%8A%A3%E5%BC%A7AB%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%BF%87%E7%82%B9M%E7%82%B9%E4%BD%9C%E2%8A%99O%E7%9A%84%E5%88%87%E7%BA%BFMP%E4%BA%A4OA%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EP%E7%82%B9%2CMD%E4%B8%8EOA%E4%BA%A4N%E7%82%B9.%281%29%E6%B1%82%E8%AF%81%3APM%3DPN%282%29%E8%8B%A5BD%3D4%2CPA%3D1.5AO%2C%E8%BF%87%E7%82%B9B%E4%BD%9CBC%E2%80%96MP%E4%BA%A4%E2%8A%99O%E4%BA%8EC%E7%82%B9%2C%E6%B1%82BC%E7%9A%84%E9%95%BF.%E5%88%86%E6%95%B0%E4%B8%8D%E5%A4%9F%E5%8F%AF%E4%BB%A5%E8%AF%B4%E5%B7%B2%E4%B8%8A%E5%9B%BE)
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