question_answer 13)

                (a) What is the minimum interior angle possible for a regular polygon? Why? (b) What is the maximum exterior angle possible for a regular polygon?

Answer:

                (a) The equilateral triangle being a regular polygon of 3 sides has the least measure of an interior angle \[={{60}^{o}}\].     (b) By (a), we can see that the greatest exterior angle is \[{{180}^{o}}-{{60}^{o}}={{120}^{o}}\].