We know that sum of exterior angles of a regular polygon is 360°
As we know that the sum of interior and exterior angle is 180°
Exterior angle + interior angle = 180°-100°=80°
When we divide the exterior angle we will get the number of exterior angles, since it is a
Regular polygon so number of exterior angles is equal to number of sides.
Therefore n=360°/ 80°=4.5
And we know that 4.5 is not a integer so it is not possible to have a regular polygon
Whose exterior angle is 100°