人教版小学数学三年级上册第三单元
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人教版小学数学三年级上册第三单元. 周长的认识. 授课人:章 敏 单 位:抚州市临川区第一小学. 什么是周长?. 封闭图形一周的长度就是这个图形的 周长。. ●. ●. 判断:红色部分是不是下列平面图形的周长?. ( ). √. ( ). √. ( ). ( ). ×. ×. 计算下面图形的周长 : (单位:厘米). 11. 8. 8. +11. +12. =31. (厘米). 12. 一样长!. 比较两个图形的周长。. (2). (1). 谢谢观看.

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人教版小学数学三年级上册第三单元

周长的认识

授课人:章 敏

单 位:抚州市临川区第一小学


什么是周长?

  • 封闭图形一周的长度就是这个图形的周长。



计算下面图形的周长:(单位:厘米)

11

8

8

+11

+12

=31

(厘米)

12


一样长!

比较两个图形的周长。

(2)

(1)



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