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  # 平行四边形的面积 PowerPoint PPT Presentation
  
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  ## 平行四边形的面积
  
  6
  
  4
  
  24
  
  6
  
  4
  
  24
  
  1、拼出的长方形与原来的平行四边形比面积变了没有？
  
  2、拼出的长方形的长和宽与原来的平行四边形的底和高有什么关系？
  
  3、能否根据长方形的面积计算公式推导出平行四边形面积计算公式？
  
  4m
  
  8m
  
  2
  
  S=ah =8×4=32（m ）
  
  4米
  
  4米
  
  6米
  
  6米
  
  (1) 平行四边形的底是7米,高是4米,面积是28米。( )
  
  (2)两个平行四边形的底相等，它们的面积相等。 ( )
  
  ×
  
  ×
  
  7分米
  
  8分米
  
  6分米
  
  ×
  
  ?
  
  h=
  
  6cm
  
  8cm
  
  4cm
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