Can't we prove theorem 8.5 using theorem 8.1 that states ' diagonal of a paralleogram divides it into two congruent triangles" ?
I meant to say :
1.Draw the diagonal
2.Based on given data, prove that 2 triangles are congruent.
3.Atlast say " as the diagonal divides the given figure into two congruent triangles it is a paralleogram."
Is my method correct??