图中阴影部分面积是多少平方厘米

  • 时间:2020-05-16 11:04:24
  • 分类:数学世界
  • 阅读:147 次

数学题:如图,平行四边形ABCD面积是72平方厘米,E是AD靠近D点的三等分点。BD与CE相交于点F,则图中阴影部分面积是多少平方厘米?

数学题解答:这题用比例做的。

BF:FD=△BEC:△CED=3:1(三角形同底,所以BF秘FD之比等于面积之比)

同底的三角形

阴影面积=72×1/2×1/3×3/4=9(由开心糊涂老师解答)

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