How many degrees a regular polygon measures depends on how many sides it has. For example, a pentagon measures 540 degrees. A triangle measures 180 degrees. To calculate a pentagon for example, use this formula. A pentagon has 5 sides. Take away 2 which is 3. Then multiply it by 180 to get your answer.
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A regular polygon will have 360 sides with exterior angles of 181 degrees.
15 equal sides
135
12
If it is a regular polygon then it will have 360/12 equals 30 sides