如图,已知
,
,
,若
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e244cfbe9ce2f0ab100f5749c855739b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd9b3b2ee631d3203dbfc3a0040e94c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f70efd7e7ffab79a90aa4f3674d196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/6/7f6522fa-9e20-4e3c-951c-982e9af6a6f1.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
23-24八年级上·全国·课后作业 查看更多[1]
(已下线)课时练习13. 3.2 含30°角的直角三角形的性质
更新时间:2023-06-06 14:56:01
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【推荐1】如图,直线a∥b∥c,直角三角板的直角顶点落在直线b上,若∠1=38°,则∠2等于( )
![](https://img.xkw.com/dksih/QBM/2016/10/11/1574246253035520/1574246259417088/STEM/7a885ffe5c40489fbacc97c3cd538ceb.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1574246253035520/1574246259417088/STEM/7a885ffe5c40489fbacc97c3cd538ceb.png)
A.38° | B.42° | C.52° | D.62° |
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【推荐2】如图,将直线
沿直线
向右平移得到直线
,若
,则
的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4e0de0c1de0835766b7f627f348c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/651765d16c8f6415d7dc63ff6f0da6fa.png)
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【推荐1】如图,点P在∠MON的角平分线上,过点P作OP的垂线交OM,ON于C、D,PA⊥OM.PB⊥ON,垂足分别为A、B,EP∥BD,则下列结论错误的是( )
![](https://img.xkw.com/dksih/QBM/2019/12/18/2357904425156608/2358664797003776/STEM/7eb86b7f0e4d4aab9a7127bb7bb46962.png?resizew=133)
![](https://img.xkw.com/dksih/QBM/2019/12/18/2357904425156608/2358664797003776/STEM/7eb86b7f0e4d4aab9a7127bb7bb46962.png?resizew=133)
A.CP=PD | B.PA=PB | C.PE=OE | D.OB=CD |
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【推荐2】如图,在
中,
,
是
的角平分线,若
,
,则
的面积是( )
![](https://img.xkw.com/dksih/QBM/2019/11/5/2327336680816640/2327552891936768/STEM/ec3ed045b7454c738ef57e8345d49eb1.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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![](https://img.xkw.com/dksih/QBM/2019/11/5/2327336680816640/2327552891936768/STEM/ec3ed045b7454c738ef57e8345d49eb1.png?resizew=152)
A.1.5 | B.2.5 | C.2 | D.3 |
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【推荐1】如图,△ABC中,AC=BC,∠ACB=120°,AB=4
,M为AB的中点,MN⊥BC,则△MNB的面积为( )
![](https://img.xkw.com/dksih/QBM/2021/7/23/2770234855374848/2776325382283264/STEM/9550567a93a0491ca370d485f7a9c4ae.png?resizew=274)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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