In a certain regular polygon, the measure of each interior angle is $2$ times the measure of each exterior angle. Find the number of sides in this regular polygon.
The sum of the interior and exterior angles = 180
So....the interior angle = 120°
To find the number of sides, n
(n - 2) 180 / n = 120
(n -2) 180 = 120n
180 n - 360 = 120n
60n = 360
n =360 / 60 = 6
+1418 
