已知直线
一块含45°角的直角三角板如图放置.若
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/437e1452-889e-4c5d-96ab-0de1c2e2577e.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98b0460266aa3c97f024009cbed4602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/647ecefc6cc0dac08bd6847d44306be5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f66dad9df7f20d64a5b2a639571f04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/437e1452-889e-4c5d-96ab-0de1c2e2577e.png?resizew=152)
A.54° | B.63° | C.64° | D.72° |
22-23九年级上·辽宁本溪·阶段练习 查看更多[4]
辽宁省本溪市2022-2023学年九年级上学期上学期第一次模拟数学试题辽宁省辽阳市第二十六中学2022-2023学年九年级上学期10月月考数学试题2022年江苏省苏州市工业园区金鸡湖中学中考数学一模试卷(已下线)数学(江苏苏州A卷)-学易金卷:2022-2023学年七年级下学期期中考前必刷卷
更新时间:2022-10-23 12:18:23
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【推荐1】给出以下命题:①对顶角相等;②在同一平面内,垂直于同一条直线的两条直线平行;③相等的角是对顶角;④内错角相等;⑤在数轴上,一个实数的绝对值越大,则表示这个数的点在数轴上离原点越远.其中假命题有( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,∠A=∠B,AE=BE,点D在AC边上,∠1=∠2,AE和BD相交于点O,若∠1=38°,则∠BDE的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/788fa463-fd75-4535-96aa-7d4fcbb806a7.png?resizew=224)
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A.71° | B.76° | C.78° | D.80° |
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【推荐1】如图,在
中,
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的中点,
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于点E.则
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/ba5b2f49-f892-4c3e-92eb-b31832e2f082.png?resizew=155)
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【推荐2】如图,在四边形
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【推荐1】如图,直线m∥n,∠1=72°,∠2=28°,则∠A=( )
![](https://img.xkw.com/dksih/QBM/2018/9/25/2040121354780672/2045154579456001/STEM/a835d2d1198c438a9b0ebec6cce6b16b.png?resizew=132)
![](https://img.xkw.com/dksih/QBM/2018/9/25/2040121354780672/2045154579456001/STEM/a835d2d1198c438a9b0ebec6cce6b16b.png?resizew=132)
A.54° | B.44° | C.28° | D.32° |
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【推荐1】如图,在△ABC 中,∠B=∠C,D 为 BC 边上的一点,E 点在 AC 边上,∠ADE=∠AED,若∠BAD=20°,则∠CDE=( )
![](https://img.xkw.com/dksih/QBM/2018/12/15/2097260569247744/2100224954490880/STEM/d9410194db4a451e81cb3917fc8d72fb.png?resizew=159)
![](https://img.xkw.com/dksih/QBM/2018/12/15/2097260569247744/2100224954490880/STEM/d9410194db4a451e81cb3917fc8d72fb.png?resizew=159)
A.10° | B.15° | C.20° | D.30° |
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【推荐2】如图,在矩形ABCD中,两条对角线AC、BD相交于点O,若∠AOD=110°,则∠CAB=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/bbfe494e-b41d-4b82-a3f1-0a60544e8556.png?resizew=225)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/bbfe494e-b41d-4b82-a3f1-0a60544e8556.png?resizew=225)
A.70° | B.65° | C.55° | D.50° |
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