回複：The maximum is n-3 reflex angles

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?

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• 回複：回複：The maximum is n-3 reflex angles -guest007- ♀ (12 bytes) () 07/21/2010 postreply 06:38:26

• A key corollary to (2) is that -外-國人- ♂ (149 bytes) () 07/21/2010 postreply 11:28:30

• Here's an easy way to visualize it -ElizabethTaylor- ♂ (428 bytes) () 07/21/2010 postreply 15:09:34

• Sorry maybe this is a mental block, but... -好吃客- ♀ (188 bytes) () 07/21/2010 postreply 19:31:38

• No, that's not necessarily the case -ElizabethTaylor- ♂ (336 bytes) () 07/22/2010 postreply 05:16:37

• Got it ! hanks a bunch! -好吃客- ♀ (0 bytes) () 07/22/2010 postreply 07:10:41