1. The diagram shows a regular nine-sided polygon (a nonagon).
2. Find the sizes of the angles marked by letters.
3. The sum of the interior angles of a n-sided polygon = 180 x (n − 2)°
4. The exterior angles of a regular polygon are each 30°. How many sides has the polygon?
5. The interior angles of a polygon add up to 5400°. How many sides has the polygon?