One full turn is 360 so the equation would be 360/ 30= 12
Let's solve for x.
Step 1: Add -3x to both sides.
Step 2: Add -8 to both sides.
Step 3: Divide both sides by 4.
The exterior angles = 180 - 157.5 = 22.5 degrees
the exterior angles of all polygons add up to 360 degrees
therefore the total number of sides n = 360 / 22.5 = 16