Lesson 1 : Equality of the areas of two parallelograms(Therorem (1) and its corollaries )
Lesson 2 : Follow : Corollaries on theroerm (1).
Lesson 3 : Equailty of the areas of two triangles (Theroerm (2) and its corollaries )
Lesson 4 : Follow : Equality of the areas of two triangles (Theroerm (3)) .
Lesson 5 : Areas of some geometric figures