三角形ABC中AC=BC,DC为边AB上一点,且角BCD=3角ACD,O为AC上一点,以O为圆心的圆O恰好经过C、D两点.(1)求证:直线AB为圆的切线(2)若BD=4,AD=2,求圆O的半径第一问做出来了,第二问应该是证相似吧,但
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![三角形ABC中AC=BC,DC为边AB上一点,且角BCD=3角ACD,O为AC上一点,以O为圆心的圆O恰好经过C、D两点.(1)求证:直线AB为圆的切线(2)若BD=4,AD=2,求圆O的半径第一问做出来了,第二问应该是证相似吧,但](/uploads/image/z/13392558-54-8.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%ADAC%3DBC%2CDC%E4%B8%BA%E8%BE%B9AB%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%B8%94%E8%A7%92BCD%3D3%E8%A7%92ACD%2CO%E4%B8%BAAC%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%BB%A5O%E4%B8%BA%E5%9C%86%E5%BF%83%E7%9A%84%E5%9C%86O%E6%81%B0%E5%A5%BD%E7%BB%8F%E8%BF%87C%E3%80%81D%E4%B8%A4%E7%82%B9.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E7%9B%B4%E7%BA%BFAB%E4%B8%BA%E5%9C%86%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%882%EF%BC%89%E8%8B%A5BD%3D4%2CAD%3D2%2C%E6%B1%82%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%E7%AC%AC%E4%B8%80%E9%97%AE%E5%81%9A%E5%87%BA%E6%9D%A5%E4%BA%86%2C%E7%AC%AC%E4%BA%8C%E9%97%AE%E5%BA%94%E8%AF%A5%E6%98%AF%E8%AF%81%E7%9B%B8%E4%BC%BC%E5%90%A7%2C%E4%BD%86)
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