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45、四边形的分类一、把图形的序号填在相应的圆圈里。梯形平行四边形二、下面图形中哪些是梯形？在括号里“√”。（）（）（）（）（）（）三、动动手，动动脑。1、在下面的梯形中画一条线段，把它们分割成一个三角形和一个平行四边形。2、在下面的三角形中画一条线段，把它们分割成一个梯形合一个三角形。四、在下面的点子图上按要求画图。·····························································································································································································································································································································································三角形长方形平行四边形梯形五、下面那两个图形可以拼出长方形、平行四边形和梯形？试着自己制作一副七巧板，并剪下来拼一拼。六、下面哪些图形是轴对称图形？有几条对称轴？画出它们的对称轴。七、你能从下图中找出多少个平行四边形？答案：略
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