It has to have at least three sides, and have at least three equivalent angles.
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The sum of the interior angles of a n-sided polygon is (n-2)*180 degrees. This is true whether or not the polygon is regular.
The sum of the internal angles of an n-sided polygon is (n-2)*180 degrees. So, for a regular polygon, each internal angle is (n-2)*180/n degrees.
The interior angles of a polygon (regular or not) with n sides sum to (n - 2)*180 degrees.
For a polygon with n sides, there would be n*(n-3)/2
The sum of the internal angles of an n-sided polygon is (n-2)*180 degrees. So, for a regular polygon, each internal angle is (n-2)*180/n degrees.