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长方体和正方体的认识

长方体和正方体的认识. (一)判断:. 1. 正方体是由 6 个正方形围成的立体图形。( ) 2. 一个长方体中,可能有 4 个面是正方形。( ). (二)填空:. 1. 因为正方体是长、宽、高都( )的长方体,所以正方体是( )的长方体。 2. 一个正方体的棱长为 a ,棱长之和是( ),当 a =6 厘米时,这个正方体的棱长总和是( )厘米。 3. 一个长方体长、宽、高分别是 a 、 b 、 h, 那么这个长方体的棱长总和是( )。. (三)应用 :.

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长方体和正方体的认识

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  1. 长方体和正方体的认识

  2. (一)判断: • 1.正方体是由6个正方形围成的立体图形。() • 2.一个长方体中,可能有4个面是正方形。()

  3. (二)填空: • 1.因为正方体是长、宽、高都()的长方体,所以正方体是()的长方体。 • 2.一个正方体的棱长为a,棱长之和是(),当a =6厘米时,这个正方体的棱长总和是()厘米。 • 3.一个长方体长、宽、高分别是a、b、h,那么这个长方体的棱长总和是()。

  4. (三)应用: • 1.一个正方体的棱长是5厘米,这个正方体的棱长总和是多少厘米? 2.用72厘米长的铁丝焊接成一个正方体的框架,这个正方体的棱长是多少厘米? • 2.用铁丝焊接成一个长12厘米,宽10厘米,高5厘米的长方体的框架,至少需要铁丝多少厘米? • 3.有一根长52厘米的铁丝,恰好可以焊接成一个长6厘米,宽4厘米,高多少厘米的长方体?

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