If the sum of exterior angles of a polygon is one - ninth the sum of its interior angles, then the polygon has ___ sides.
Let the number of sides = n
Sum of exterior angles = 360∘
Sum of interior angles =(n−2)×180∘
360 = (n - 2) 20
18 = n - 2
n = 20
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 a regular polygon has n sides, then the sum of its exterior angles is
If the sum of interior angles of a polygon is 1080°, then the polygon has ____ sides.