二年级数学下册六《认识图形》平行四边形和欣赏与设计同步精炼北师大版.doc

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1平行四边形和欣赏与设计1判断。 (1)平行四边形具有稳定性,不易变形。 ( ) (2)平行四边形有 4 个角,对角一定是直角。 ( ) (3)对边平行且相等的四边形是平行四边形。 ( ) (4)平行四边形必须有两个角是钝角。 ( ) 2在下面的图形中,哪些是正方形,哪些是长方形,哪些是平行四边形?正方形有( );长方形有( );平行四边形有( )。 3先数一数,再填空。 (1)有( )个正方形。(2)有( )个平行四边形,有( )个三角形。(3)有( )个平行四边形。1(1) (2) (3) (4) 2正方形: 长方形: 平行四边形: 3(1)8 (2)2 3 (3)9 2

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