AB是圆O的直径,AM,BN分别切圆O于A,B.CD交AM,BN于D,C.DO平分∠ADC.(1)求证:CD是圆O的切线.(2)若AD=4,BC=9,求圆O的半径R{注:本题请自己画图}
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![AB是圆O的直径,AM,BN分别切圆O于A,B.CD交AM,BN于D,C.DO平分∠ADC.(1)求证:CD是圆O的切线.(2)若AD=4,BC=9,求圆O的半径R{注:本题请自己画图}](/uploads/image/z/5203451-11-1.jpg?t=AB%E6%98%AF%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAM%2CBN%E5%88%86%E5%88%AB%E5%88%87%E5%9C%86O%E4%BA%8EA%2CB.CD%E4%BA%A4AM%2CBN%E4%BA%8ED%2CC.DO%E5%B9%B3%E5%88%86%E2%88%A0ADC.%281%29%E6%B1%82%E8%AF%81%EF%BC%9ACD%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF.%EF%BC%882%EF%BC%89%E8%8B%A5AD%3D4%2CBC%3D9%2C%E6%B1%82%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84R%7B%E6%B3%A8%EF%BC%9A%E6%9C%AC%E9%A2%98%E8%AF%B7%E8%87%AA%E5%B7%B1%E7%94%BB%E5%9B%BE%7D)
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