# Each exterior angle of a certain regular polygon measures 30. How many sides does the polygon have?

Number of sides of the polygon is $12$.
Sum of exterior angles of every polygon irrespective of number of its sides is ${360}^{o}$.
As it is a regular polygon, all exterior angles are equal and are ${30}^{o}$.
Hence number of sides of the polygon is ${360}^{o} / {30}^{o} = 12$.