如图,两块完全相同的含
角的直角三角板
和
叠合在一起,将三角板
绕直角顶点
按逆时针方向旋转角
,有以下四个结论:
①当
时,
与
的交点恰好为
中点;
②当
时,
恰好经过
;
③在旋转过程中,存在某一时刻,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6b4cf4158ff965b25028549be5d16a.png)
④在旋转过程中,始终存在
;
共中结论正确的有多少个( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1264a2e3609e1c274acb89b5ea5019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1264a2e3609e1c274acb89b5ea5019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3881e5282bb626671ea550d17d744cf.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
③在旋转过程中,存在某一时刻,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6b4cf4158ff965b25028549be5d16a.png)
④在旋转过程中,始终存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efb43203acbf1f8ed0a31962a531c03.png)
共中结论正确的有多少个( )
A.1个 | B.2个 | C.3个 | D.4个 |
22-23八年级下·河北保定·期末 查看更多[3]
河北省保定市第十三中学2022-2023学年八年级下学期期末数学试题(已下线)第23章 旋转(单元测试·拔尖卷)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题6.19 平行四边形(题型分类专题)(分层练习)(拨尖练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2023-07-23 15:50:43
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ba5d2df59d14af6d0b73a16664806a.png)
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A.①②④ | B.②③④ | C.①②③ | D.①③④ |
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【推荐1】如图,∠MON=30°,点A1、A2、A3…在射线ON上,点B1、B2、B3…在射线OM上,△A1B1A2、△A2B2A3、△A3B3A4…均为等边三角形,从左起第1个等边三角形的边长记为a1,第2个等边三角形的边长记为a2,以此类推.若OA1=1,则a2015=( )
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【推荐1】如图,将平行四边形
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【推荐2】如图,边长为2的正方形ABCD的顶点A、B在一个半径为2的圆上,顶点C、D在该圆上.将正方形ABCD绕点A逆时针旋转,当点D第一次落在圆上时,点C运动的路线长为( )
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