二年级数学下册六《认识图形》长方形与正方形精练北师大版.doc

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1长方形与正方形一、填空。(1)的对边( ),四个角都是( )角。 (2)的四条边( ),四个角都是( )角。 (3)长方形、正方形都是由( )条线段围成的图形,所以它们都是( )边形。 2、选一选。1.摆一个正方形至少需要( )根同样的木棒,摆一个长方形至少需要( )根同样长的木棒。A. 4 B. 8 C. 62.如果长方形的( ) ,就变成了正方形。A. 长和宽相等 B. 长是宽的2倍 C. 长大于宽3.下图中有( )个长方形。A. 4 B. 6 C. 9三、数一数,再填空。 (1)有( )个长方形。 (2)有( )个正方形。四、下图中两根同样长的铁丝曾围成过正方形和长方形,请根据铁丝上的折痕判断哪一根是围成长方形的?哪一根是围成正方形的?2参考答案一、(1)相等 直 (2)都相等 直 (3)4 四 二、1.A,C。2.A。3.C。三、(1)9 (2)5 四、根据折痕判断,第一根铁.的每一段长度都相等,明显是曾折成过正方形;第二根铁.的第一、三段长度相等,第二、四段长度相等,曾折成过长方形。3

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