If the sum of the interior angles of a polygon is two times the sum of its exterior angles, then the polygon has ___ sides.
7
6
5
8
If the sum of exterior angles of a polygon is one - ninth the sum of its interior angles, then the polygon has ___ sides.
If the sum of the interior angles of a regular polygon is five times the sum of its exterior angles, then the number of sides it has is
If the sum of interior angles of a polygon is 1080°, then the polygon has ____ sides.