The exterior angle measures of a regular polygon is 20 degrees. how many sides does the polygon have

The sum of all the exterior angles of a polygon has to be 360 degrees. The exterior angle of a regular polygon is 20 degrees. So, we need to divide 360 degrees by 20 degrees to get the number of sides of this polygon. 360/20 equals 18 sides. So, if the exterior angle of a regular polygon is 20 degrees, it will have 18 sides. Hope this helped!

Aand b is what i think