如图,两个同心圆的半径分别为4cm和5cm,大圆的一条弦AB与小圆相切,则弦AB的长为_____ .
![](https://img.xkw.com/dksih/QBM/2019/1/16/2120131047915520/2120980581326848/STEM/b5f95d52a64d4468b73a50722ac71a0d.png?resizew=100)
更新时间:2017-10-13 19:27:50
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【推荐1】如图,在正方形纸片ABCD中,EF∥AD,M,N是线段EF的六等分点,若把该正方形纸片卷成一个圆柱,使点A与点D重合,此时,底面圆的直径为10cm,则圆柱上M,N两点间的距离是____ cm.
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【推荐2】如图,直线AB与x轴、y轴分别相交于A、B两点,点A(-3,0),点 B(0,
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