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角的初步认识

角的初步认识. 剑湖实验学校 居芝娟. 边. 边. 边. 顶点. 边. 顶点. 顶点. 边. 边. 一个角有 1 个顶点和 2 条边 。. 找一找. 请你找一找我们教室里的角,然后摸一摸你所找到的角。. 边. 顶点. 边. 6. 5. 3. 4. 1. 2. 下面的图形中各有几个角?. 2. ( )个. 1. ( )个. 3. ( )个. ( )个. 5. 闯关一:. 1 、你能用两根小棒做一个角吗?. 2 、同桌两人比一比谁做的角大。. 角是有大小的。. 3 、你能把刚才做的角变大变小吗?怎么变 ?.

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角的初步认识

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  1. 角的初步认识 剑湖实验学校 居芝娟

  2. 边 边 顶点 边 顶点 顶点 边 边 一个角有1个顶点和2条边 。

  3. 找一找 请你找一找我们教室里的角,然后摸一摸你所找到的角。

  4. 顶点 边

  5. 6 5 3 4 1 2

  6. 下面的图形中各有几个角? 2 ( )个 1 ( )个 3 ( )个 ( )个 5

  7. 闯关一: 1、你能用两根小棒做一个角吗? 2、同桌两人比一比谁做的角大。 角是有大小的。 3、你能把刚才做的角变大变小吗?怎么变? 角的大小与两边张开的程度有关,与边的长短无关。

  8. 闯关二: 下面钟面上时针和分针形成的角,哪个最大,哪个最小?

  9. 游戏: 拿出两张长方形纸,折出两个不同大小的角,并做好标记再比一比哪个角大。

  10. 如果你是角,你准备怎么来介绍自己?

  11. 拍手唱儿歌 小小角,真简单,                        一个顶点两条边。                        画角时,要牢记,                        先画顶点后画边。 每个角,有大小, 不管边的长和短。

  12. 谢谢指导

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