如图,
是
的弦,
,
的延长线交
于点
,若
,
,则
长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e4ceabf0daf448d295489a489a6868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab6b7f0d88caf738cc0648a9cbb87ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-02-28 09:57:08
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【推荐1】如图,AB为圆O的直径,C、D两点均在圆上,其中OD⊥AC交AC于E点.若DE=1,BC=6,则AC=( )
![](https://img.xkw.com/dksih/QBM/2021/6/3/2735259033321472/2750628553654272/STEM/c633fb59-f181-4a12-8b5a-eaf0d778939f.png)
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【推荐2】数学小组研究如下问题:东莞市地处北纬约
的纬度上,求北纬
纬线的长度,小组成员查阅相关资料,得到如下信息:
信息一:如图1,在地球仪上,与赤道平行的圆圈叫做纬线;
信息二:如图2,赤道半径
约为6400千米,弦
,以
为直径的圆的周长就是北纬
纬线的长度;(参考数据:
,
,
,
)
根据以上信息,北纬23纬线的长度约是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2690e1a00ef032f0d6a0082e4eee46b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2690e1a00ef032f0d6a0082e4eee46b1.png)
信息一:如图1,在地球仪上,与赤道平行的圆圈叫做纬线;
信息二:如图2,赤道半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b0f2c0352a94898281927fa8cb7a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2690e1a00ef032f0d6a0082e4eee46b1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5241fdf84918d9b59b48888cff38378.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1689b1a9cfb01e3e891453b3d667cc.png)
根据以上信息,北纬23纬线的长度约是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/946ade09-dae5-4da6-b81e-5c4933d30a5c.png?resizew=422)
A.5900千米 | B.16000千米 | C.35000千米 | D.42000千米 |
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【推荐1】已知一个不等臂跷跷板
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﹔如图2,当
的另一端B着地时,
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的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/aa787d04-56f9-4551-86e2-8c27798ac962.png?resizew=438)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.0.5米 | B.0.6米 | C.![]() | D.0.8米 |
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【推荐2】如图,半径为1的☉O是△ABC的外接圆,连接OB、OC,若∠A=60°,则边BC的长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/a7db4082-558a-4f5b-965b-03d46e7f4ca6.png?resizew=135)
A.1 | B.![]() | C.![]() | D.![]() |
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