Is the measure of a 9-gon exterior angles greater than the measure of a 4-gon exterior angles?

Answer 1

5

Answer 2

It can be, but need not be.

Each exterior angles of a REGULAR 9-gon is 360/9 = 40 deg while that of a 4-gon in 360/4 = 90 deg but that is only true for regular polygons.