家住蒲汇塘边，闲来打渔为生.大陆帖子常被和谐，所有博客都曾被关闭。此地来偷闲。 My blog were censored or blocked in mainland China. To backup my files, post here.
The picture shows the math principle of self accurate method for icosikai-petagon. The angel is central angel.
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