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5.3正方形(1)浙教版

发布时间:2014-04-23 13:16:46  

回顾并思考:
1.我们已经学习过哪些特殊的平行四边形?
2.是否存在一组邻边相等的特殊的矩形?若存在,它 是什么图形? 3.是否存在一个角是直角的菱形?若存在,它是什 么图形?

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5.3 正方形(1)

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正方形的定义

有一组邻边相等并且有一个角是直角的平行四 边形叫做正方形(spuare)。

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