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汗……………… 高中时学的公式，没想起来

Posted by atlas_of_rruucc at 2004-12-10 10:53:35 on Problem 2150
In Reply To:Re:nealzane大牛用什么方法做的?说一下吧 Posted by:nealzane at 2004-12-10 10:47:22 
> area of a space planar polygon = 
> area of its shadow / cos(angle between the plane it belongs to and the plane the shadow belongs to)
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