解答题-证明题 适中0.65 引用46 组卷3467
已知在以点O为圆心的两个同心圆中,大圆的弦AB交小圆于点C,D(如图).
(1)求证:AC=BD;
(2)若大圆的半径R=10,小圆的半径r=8,且圆O到直线AB的距离为6,求AC的长.
![](https://img.xkw.com/dksih/QBM/2014/10/8/1573751835107328/1573751841382400/STEM/6e926d8b3350471ca1ff17f8aaeea449.png?resizew=115)
(1)求证:AC=BD;
(2)若大圆的半径R=10,小圆的半径r=8,且圆O到直线AB的距离为6,求AC的长.
![](https://img.xkw.com/dksih/QBM/2014/10/8/1573751835107328/1573751841382400/STEM/6e926d8b3350471ca1ff17f8aaeea449.png?resizew=115)
2014·浙江湖州·中考真题
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