4. Examine the table. (Each figure is divided into triangles and the sum of the angles deduced from that.)

What can you say about the angle sum of a convex polygon with number of sides?
10
                
                  10
angle sum of a convex polygon 
angle sum of a convex polygon with 10 sides 
angle sum of a convex polygon with 10 sides 
angle sum of a convex polygon with 10 sides