我国明代科学家徐光启在《农政全书》中描绘了一种我国古代常用的水利灌溉工具——筒车,如图,筒车盛水桶的运行轨道是以轴心
为圆心的圆,已知圆心
在水面的上方,
的半径长为5米,
被水面截得的弦
长为8米,点
是运行轨道的最低点,则点
到弦
的距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.5米 | B.4米 | C.3米 | D.2米 |
更新时间:2024-05-24 15:43:37
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【推荐1】如图,在
中,
,
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的垂直平分线
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于点E,
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A.6 | B.![]() | C.9 | D.![]() |
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【推荐2】若3,
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A.4 | B.![]() | C.4或34 | D.4或![]() |
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【推荐1】一次综合实践主题为:只用一张矩形纸条和刻度尺,如何测量一次性纸杯杯口的直径?小聪同学所在的学习小组想到了如下方法:如图,将纸条拉直并紧贴杯口,纸条的上下边沿分别与杯口相交于A、B、C、D四点,然后利用刻度尺量得该纸条的宽为
,
,
.请你帮忙计算纸杯的直径为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/971828b9-f58a-465f-941d-30367d1478ed.png?resizew=429)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1b7aa6e3693af226ef7324c37534c1.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,石拱桥是圆弧形(劣弧),其跨度为24米,拱的半径为13米,则拱高为 ( )
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