Sum of Interior Angles of Polygones

Look at the relation between sum of angles and number of sides of polygons.
Sum of Interior Angles of Polygones
[*][b]Change n and look at changes in interior angles.[/b][br][*][b]After first step, now look at changes in sum of interior angles.[/b][br][*][b]Finally, try to discover proper formula in order to find sum of interior angles of polygons.[/b]

Information: Sum of Interior Angles of Polygones