1 is not enough.

来源: yma16 于 2004-01-17 18:52:00 [] [旧帖] [给我悄悄话] 阅读数 : (120 bytes)
回答: Equilateral Triangle 由 yma16 于 2004-01-17 09:52:00

You can cut out an equilateral triangle of side 1 inch out of a board and it will fall off. Do you agree without try it?



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