如下图,三角形ABC的面积为72cm²,点D在线段AC上,点F在线段BC的延长线,BC=2CF,且DCFE是平行四边形.阴影部分的面积是( )cm²
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![如下图,三角形ABC的面积为72cm²,点D在线段AC上,点F在线段BC的延长线,BC=2CF,且DCFE是平行四边形.阴影部分的面积是( )cm² ](/uploads/image/z/3663499-67-9.jpg?t=%E5%A6%82%E4%B8%8B%E5%9B%BE%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA72cm%26%23178%3B%2C%E7%82%B9D%E5%9C%A8%E7%BA%BF%E6%AE%B5AC%E4%B8%8A%2C%E7%82%B9F%E5%9C%A8%E7%BA%BF%E6%AE%B5BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%2CBC%3D2CF%2C%E4%B8%94DCFE%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2.%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF%EF%BC%88++++%EF%BC%89cm%26%23178%3B+%26%238205%3B%26%238205%3B%26%238205%3B)
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如下图,三角形ABC的面积为72cm²,点D在线段AC上,点F在线段BC的延长线,BC=2CF,且DCFE是平行四边形.阴影部分的面积是( )cm²
如下图,三角形ABC的面积为72cm²,点D在线段AC上,点F在线段BC的延长线,BC=2CF,且DCFE是平
行四边形.阴影部分的面积是( )cm²
如下图,三角形ABC的面积为72cm²,点D在线段AC上,点F在线段BC的延长线,BC=2CF,且DCFE是平行四边形.阴影部分的面积是( )cm²
DE=CF=1/2 BC
阴影=S-ADE+S-BDE= 1/2 DE * ABC的高= 1/2 ABC面积=36