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如图,从圆O外一点A引圆的切线AD和割线ABC,已知,圆O的半径r=AB=4,则...

如图,从圆O外一点A引圆的切线AD和割线ABC,已知6ec8aac122bd4f6e,圆O的半径r=AB=4,则圆心O到AC的距离为                   .

说明: 6ec8aac122bd4f6e

 

 

 

 

 

【解析】略
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