so the formula is more useful here. (53 – 2) × 180 = 51 × 180 = 9180. The interior angles of a 53-sided polygon sum to 9180°. A regular polygon is a polygon with all sides and angles equal.

How would you work out the sum of internal angles in a polygon that has more than 4 sides? There is a formula that you can use to work out the sum of internal angles that works for all polygons ...