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.
2011年12月14日星期三
Nonagon construction with straght and compass at 9.2E-14
It take me four days to find this hyperaccuracy method to construct Nonagon at relative error 9.2E-14. This final version can be drawed normaly by straght and compass.
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