小华为了求出一个圆盘的半径,他用所学的知识,将一宽度为2cm的刻度尺的一边与圆盘相切,另一边与圆盘边缘两个交点处的读数分别是“4”和“16”(单位:cm),请你帮小华算出圆盘的半径是_____ cm.
![](https://img.xkw.com/dksih/QBM/2018/7/12/1986905172402176/1989269672165376/STEM/491ac292833e4ab29e701b5dfb757a14.png?resizew=138)
更新时间:2018-07-15 22:42:25
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【推荐2】如图,将含有
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