周长的认识

Nov 18, 2014

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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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周长的认识

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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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