1、长方形和正方形周长的计算长方形和正方形周长的计算学习目标学习目标1.1.根据周长的含义探索长、正方形等根据周长的含义探索长、正方形等平面图形周长的计算方法。平面图形周长的计算方法。2.2.会计算长、正方形等平面图形的周会计算长、正方形等平面图形的周长。长。长长宽宽长方形对边相等长方形对边相等6厘米厘米4厘米厘米6厘米厘米4厘米厘米看一看看一看一个长方形，长一个长方形，长6 6厘米，宽厘米，宽4 4厘米。它的厘米。它的周长是多少厘米？周长是多少厘米？4 4厘米厘米6 6厘米厘米一个长方形，长一个长方形，长6厘米，宽厘米，宽4厘米。它厘米。它的周长是多少厘米？的周长是多少厘米？6 64 46 64
2、 42020（厘米）（厘米）4 4厘米厘米6 6厘米厘米一个长方形，长一个长方形，长6 6厘米，宽厘米，宽4 4厘米。厘米。它的周长是多少厘米？它的周长是多少厘米？6 62 24 42 22020（厘米）（厘米）4 4厘米厘米6 6厘米厘米一个长方形，长一个长方形，长6 6厘米，宽厘米，宽4 4厘米。厘米。它的周长是多少厘米？它的周长是多少厘米？（6 64 4）2 210102 22020（厘米）（厘米）4 4厘米厘米6 6厘米厘米一个长方形，长一个长方形，长6 6厘米，宽厘米，宽4 4厘米。它的周厘米。它的周长是多少厘米？长是多少厘米？6 64 46 64 42020（厘米）（厘米）6 62
3、 24 42 22020（厘米）（厘米）（6 64 4）2 22020（厘米）（厘米）谁的算法比较简便？谁的算法比较简便？长方形周长（长宽）长方形周长（长宽）213厘米厘米7厘米厘米5米米7米米（137）240（厘米）（厘米）（75）224（米）（米）试一试试一试1212试一试试一试25厘米厘米四边相等四边相等254100（厘米）（厘米）25+25+25+25100（厘米）（厘米）正方形周长边长正方形周长边长4 41练一练练一练8分米分米一块正方形花圃，边长是一块正方形花圃，边长是1010米，它的周长是多少米？米，它的周长是多少米？235米米团Tiffany，a 16yearold girl，
4、was very shy.Last September，her best friend，Sophie，moved abroad with her family because she had to continue her studies in America.She even said she would not come back for at least a few years.1 “I was really sad the moment I heard the bad news and I didnt know what to do，”Tiffany recalled.“I shut
5、myself in my room for a whole week.It was then that my aunt took me to a sports club one Saturday and I saw so many young people playing different kinds of sports there.I signed up for a beginners course in volleyball and since then I have been playing this sport.Now I practice twice a week there.It
6、 is wonderful playing sports in this club and I have made lots of friends as well.2 ”The most basic aim of playing sports is that you can improve your health even if you are not very good at sports.Besides，you can get to know a circle of people at your age while playing sports.3 Since she joined the
7、 sports club，she has opened up herself and now she has become very active and enjoys meeting and talking with others.1Its polite for girls to kiss each other on the side of the face.4Its no big deal.For most people，that is one of the reasons why they join a sports club.4 You dont have to sit down an
8、d talk to strangers.You go in for sports and it is easier to understand your partners on the same team.Now Tiffany is quite popular with her friends and she has also become more confident.团圆圆一家在台湾可受欢迎了。每天，小朋友们排着长队，等着跟它们合影留念。从“排着长队”体现出每天喜欢它们的人不计其数，特别受欢迎。从“合影留念”体现出大家都想和大熊猫留住最美丽的瞬间以作纪念。Nothing can be accomplished without norms or standards.感谢阅读下载！祝你生活愉快，身体健康
