Question

what is the minimum interior angle possible for a regular polygon

Answer 1

Triangle is the polygon with minimum number of sides and an equilateral triangle is a regular polygon because all sides are equal in this. We know that each angle of an equilateral triangle measures 60 degree. Hence, 60 degree is the minimum possible value for internal angle of a regular polygon.

Answer 2

60° is the minimum interior angle for a regular polygon.
Since a triangle is a smallest polygon