Previous finding general formula of pythagorean theorem, this subject provides children with understanding relationship among areas of polygons. After the analyzing, they will reach that the area of polygon which is formed by hypotenuse of the right triangle is equal to sum of the other areas formed by the other sides of triangle.

When the number of sides increaded or decreased, how the areas change?
Is there any relationship among areas of polygoans?
If there is a relation with these areas how can you explain it?
Why does the relation not change in all conditions although you change in number of sides?
Can you generalize the situation above by emphasizing on calculation of the areas?