三道关于圆的数学题 31.已知:如图,⊙O中,\x1fAO=AC=AB.求证:BC切⊙O于C.\x1f\x0532.如图,在RtΔABC中,∠C=900,BC =4,AC =3,CD为直径的⊙O与AB相切于E,求⊙O的半径.33.如图,⊙O1和⊙O2的半径分别是20cm和12cm,O1O2=4
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![三道关于圆的数学题 31.已知:如图,⊙O中,\x1fAO=AC=AB.求证:BC切⊙O于C.\x1f\x0532.如图,在RtΔABC中,∠C=900,BC =4,AC =3,CD为直径的⊙O与AB相切于E,求⊙O的半径.33.如图,⊙O1和⊙O2的半径分别是20cm和12cm,O1O2=4](/uploads/image/z/12531716-44-6.jpg?t=%E4%B8%89%E9%81%93%E5%85%B3%E4%BA%8E%E5%9C%86%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98+31.%E5%B7%B2%E7%9F%A5%3A%E5%A6%82%E5%9B%BE%2C%E2%8A%99O%E4%B8%AD%2C%5Cx1fAO%3DAC%3DAB.%E6%B1%82%E8%AF%81%3ABC%E5%88%87%E2%8A%99O%E4%BA%8EC.%5Cx1f%5Cx0532.%E5%A6%82%E5%9B%BE%2C%E5%9C%A8Rt%CE%94ABC%E4%B8%AD%2C%E2%88%A0C%3D900%2CBC+%3D4%2CAC+%3D3%2CCD%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E2%8A%99O%E4%B8%8EAB%E7%9B%B8%E5%88%87%E4%BA%8EE%2C%E6%B1%82%E2%8A%99O%E7%9A%84%E5%8D%8A%E5%BE%84.33.%E5%A6%82%E5%9B%BE%2C%E2%8A%99O1%E5%92%8C%E2%8A%99O2%E7%9A%84%E5%8D%8A%E5%BE%84%E5%88%86%E5%88%AB%E6%98%AF20cm%E5%92%8C12cm%2CO1O2%3D4)
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