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 self accurate method for Triskaidecagon is similar to other nonconstructive polygon. The math principle is showed on the picture.
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