七种吗?

来源: m6412 于 2010-10-17 12:39:12 [旧帖] [给我悄悄话] 本文已被阅读：次

四直角

三钝一锐

二钝一直一锐

二钝二锐

一钝三锐

一钝一直二锐

一钝二直一锐

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