2018年秋九年级数学上册第23章旋转23.1图形的旋转23.1.1旋转的概念及性质(预习)课件(新版)新人教版.ppt

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第二十三章 旋转,23.1 图形的旋转,第二十三章 旋转,第1课时 旋转的概念及性质,第1课时 旋转的概念及性质,探究新知,活动1 知识准备,A,C,A,B,第1课时 旋转的概念及性质,2平移前后的两个图形是_形,对应点的连线_(或在同一直线上)且_;,3具有轴对称关系的两个图形是_形,对应点的连线被对称轴_,相等,全等,平行,垂直平分,全等,第2课时 用配方法解一元二次方程,活动2 教材导学,旋转的概念及性质,B,OB,OB,AB,AB,第1课时 旋转的概念及性质,A的对应角是_,即A_; B的对应角是_,即B_; 旋转中心是点_; 旋转的方向是_; 旋转的角度是_; OA的中点D的对应点是_的中点,OA,A,A,B,B,O,逆时针,45,

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