题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141716-57255.png)
A.40° | B.50° | C.60° | D.70° |
答案
解析
试题分析:根据旋转的性质可得∠DAD′=∠BAC=40°,AD′=AD,再根据三角形的内角和定理求解即可.
由题意得∠DAD′=∠BAC=40°,AD′=AD
则∠ADD′=(180°-∠DAD′)÷2=70°
故选D.
点评:解题的关键是熟练掌握旋转的性质:每一条边旋转的角度相等,均等于旋转角.
核心考点
试题【如图,△ABC中,AB=AC,∠BAC=40°,D为△ABC内一点,如果将△ACD绕点A按逆时针方向旋转到△ABD′的位置,则∠ADD′的度数是A.40°B.5】;主要考察你对轴对称等知识点的理解。[详细]
举一反三
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141707-47135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141707-41097.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141708-39035.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141657-37034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141658-18407.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141659-67880.jpg)
(1) 在旋转过程中, 线段
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141659-38093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141659-20915.png)
(2) 当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141659-43369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141700-36919.png)
(3) 在(2)的情况下, 求线段
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141700-22699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141648-91330.png)
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A.先向下平移3格,再向右平移1格 | B.先向下平移2格,再向右平移1格 |
C.先向下平移2格,再向右平移2格 | D.先向下平移3格,再向右平移2格 |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141611-10995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141612-37730.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141612-10744.png)
(1)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141612-36792.png)
(2)如图,将边长为1的正方形ABCD放置在平面直角坐标系xOy中,且顶点A在x轴上.若正方形ABCD沿
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141613-68073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141613-68073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141613-68073.png)
如图,在平面直角坐标系xOy中,已知点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141555-76648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141555-12555.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141556-53648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141556-53648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141556-13819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141556-57608.png)
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(1)写出点M5的坐标;
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141558-56082.png)
(3)我们规定:把点
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141559-67513.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141600-80646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106141600-80646.png)
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