已知在直径为20cm的圆中,如果圆心到一条弦的距离是8cm,那么这条弦的长度是( )
A.28cm | B.8cm | C.12cm | D.14cm |
更新时间:2023-01-23 19:01:00
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【推荐1】如图,
中,
,观察尺规作图的痕迹,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/37f24143-f72e-478f-8e39-baddb671c5ab.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/37f24143-f72e-478f-8e39-baddb671c5ab.png?resizew=174)
A.9 | B.8 | C.7 | D.6 |
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【推荐2】如图所示的圆柱形杯子的内直径为
,内部高度为
,小颖把一根直吸管放入杯中,要使吸管不斜滑到杯里,则吸管的长度(整厘米数)最短是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/fd1031ee-38a3-472f-86d1-d5732a0ede88.png?resizew=68)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f8895e74afa977c97c06864cde4f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c596eaee514af2bec0d12f01737fed.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】“今有圆材,埋在壁中,不知大小,以锯锯之,深一寸,锯道长一尺,问径几何?”这是《九章算术》中的一个问题,用现代的语言表述为:如图,
为
的直径,弦
于E,
寸,弦
寸,则
的半径为多少寸 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/f275abe0-08a5-4b7d-a436-5813b6fd4c30.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
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A.5 | B.12 | C.13 | D.26 |
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【推荐2】在直径为10m的圆柱型油槽内注入一些油后,截面如图所示,液面宽AB=6m,如果继续向油槽内注油,使液面宽为8m,那么液面上升了( )m
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/7c4e8364-461b-4675-bdc2-06435957dfa0.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/7c4e8364-461b-4675-bdc2-06435957dfa0.png?resizew=172)
A.1 | B.2 | C.1或7 | D.2或6 |
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