回複:The maximum is n-3 reflex angles

來源: 2010-07-21 06:20:14 [舊帖] [給我悄悄話] 本文已被閱讀:

Thanks a lot! I thought along the same line too, but has great difficulty to visualize such a polygon. For example, for a 8-sided polygon, it's easy to draw it as 1 concave angle, 1 convex angle subsequently. Where can the 5th concave angle be?