在平面直角坐标系中,O(0,0),A(1,
),点A绕点O顺时针旋转90°得到点B,则B点的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
A.(![]() ![]() | B.(![]() ![]() | C.(3,1) | D.(![]() |
更新时间:2021-10-27 11:07:57
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【推荐1】下列叙述中:①任意一个三角形的三条高至少有一条在此三角形内部;②以a,b,c为边(a,b,c都大于0,且a+b>c)可以构成一个三角形;③一个三角形内角之比为3:2:1,此三角形为直角三角形;④有两个角和一条边对应相等的两个三角形全等;是真命题的有( )个
A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图,点A,B,C在一条直线上,△ABD,△BC均为等边三角形,连接AE、CD,PN、BF下列结论:①△ABE≌△DBC;②∠DFA=60°;③△BPN为等边三角形;④若∠1=∠2,则FB平分∠AFC.其中结论正确的有( )
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219620014047232/2222753234747392/STEM/c3b07649e4ab4fec90fbed4359cf286d.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219620014047232/2222753234747392/STEM/c3b07649e4ab4fec90fbed4359cf286d.png?resizew=178)
A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐1】如图,在
中,
,将
绕点
顺时针旋转得到
当点
的对应点
恰好落在
上时,连接
则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2020/8/24/2534969353396224/2541014331301889/STEM/eb58ef2f0a7c425e86114a5b969fce9b.png?resizew=203)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd4c8687358d042dc2f003217716470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a178b051f7ce6245bc53d580321a9fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8956e91bc6771b1619761efd1f7928f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
![](https://img.xkw.com/dksih/QBM/2020/8/24/2534969353396224/2541014331301889/STEM/eb58ef2f0a7c425e86114a5b969fce9b.png?resizew=203)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图所示,点P是正方形ABCD内一点,将△ABP绕点B按顺时针方向旋转后与△CBP1重合.如果PB=5,那么PP1=( ).
![](https://img.xkw.com/dksih/QBM/2018/11/12/2074008382619648/2074917499191296/STEM/04be38901aae4457b9e3f97438dfeb55.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2018/11/12/2074008382619648/2074917499191296/STEM/04be38901aae4457b9e3f97438dfeb55.png?resizew=84)
A.5 | B.![]() | C.6 | D.![]() |
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