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角的初步认识

角的初步认识. 1 、直线的线是直的 ,. 2 、可以向两端无限延长 ,. 3 、直线没有端点. 直线. ?. 线段的线是直的 ,. 线段是有一定长度的 ,. 线段有两个端点. 线 段. 射线的线是直的 ,. 射线是无限长的 ,. 射线 只有 一个端点. 射 线. 思考 : 射线有什么特点 ?. 从一点出发可以画无数条射线。. 边. 顶点. 边. 小马. √. √. ×. √. ×. ×. 下面图形有几个角？. 3 个角. 4 个角. 3 个角. 比一比，哪个角大？.

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角的初步认识

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  1. 角的初步认识

  2. 1、直线的线是直的, 2、可以向两端无限延长, 3、直线没有端点. 直线 ?

  3. 线段的线是直的, 线段是有一定长度的, 线段有两个端点. 线 段

  4. . 射线的线是直的, 射线是无限长的, 射线只有一个端点. 射 线 思考: 射线有什么特点?

  5. 从一点出发可以画无数条射线。

  6. 边 顶点 边

  7. 小马 √ √ × √ × ×

  8. 下面图形有几个角？ 3个角 4个角 3个角

  9. 比一比，哪个角大？

  10. 一张长方形的纸有4个角，用剪刀剪一刀，剪去一个角，还剩几个角？一张长方形的纸有4个角，用剪刀剪一刀，剪去一个角，还剩几个角？

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