角的初步认识
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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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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?



顶点


小马

×

×

×


下面图形有几个角?

3个角

4个角

3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?