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角的初步认识
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角的初步认识. 12. 9. 3. 6. (一)魔术表演,激趣引入. 先让我们看看 生活中的角吧!. (二)引导发现,活动探究. 顶 点. 边. 边. 边. 边. 顶 点. 总结:. 小小角,真简单,. 一个顶点两条边。. 画角时,要牢记,. 先画顶点再画边。. 第一关:慧眼识角. 数学游乐园. 判断:下面图形是不是角,如果是画 ? 不是画 ,并说说为什么?. (1) ( ). (2) ( ). (3) ( ). (4) ( ).
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角的初步认识
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