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已知圆O的半径为3,从圆O外一点A引切线AD和割线ABC,圆心O到AC的距离为2...
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已知圆O的半径为3,从圆O外一点A引切线AD和割线ABC,圆心O到AC的距离为2
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,AB=3,则切线AD的长为
.
考点分析:
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