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bigone
Yang 准备GRE的学习经验记录,看到的跟经济相关的文章,琐事
Monday, June 9, 2008
butterfly
任意一个圆,任意做一条弦EF,找到该弦的中点O,然后穿过这个中点任意做两条弦一条弦与圆的交点为A,B;另外一条弦与圆的交点为C,D;现在连接AC与BD分别交原来弦EF得到两个点G,H(注意不连接AD与BC,那样将与EF没有交点)请证明OG=OH
呵呵 这就是有名的蝴蝶定理
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Big one
a programmer and movie-fans. Write to me if you got any question related to PC. Recently I have been busy for IELTS, especially the Writing and Speaking parts.
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