1Explain why the interior angles of an n sided polygon total (n - 2) x 180°.
2Why do the exterior angles of every polygon add up to 360°?
3What does it mean for a polygon to be regular, and why is a rectangle not regular?
4Each interior angle of a regular polygon is 162°. Find the number of sides, using the quickest method.
5Does the angle sum formula still work for a polygon that has been badly squashed out of shape?