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六年级数学下册3.2《图形的旋转（二）》课件1北师大版.ppt

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顺时针旋转90,绕点A顺时针旋转90。,A,B,C,B,C,绕点B逆时针旋转90。,A,B,C,A,C,1.想一想，填一填。,2.画出图中长方形绕点M顺时针旋转90后的图形，再画出长方形绕点N逆时针旋转90后的图形。,3.想一想，图中的三角形绕中心点每次旋转多少度能得到这个图案？图中的正方形呢？,60,45,

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