Given data:
Four triangles with given dimension and angles.
The angle side angle property holds good here,
Two angles and its included side.
The remmaing angle of triangle A is 60° and included side between 50° and 60° is 9.
For triangle B included side between 50° and 60° is 9.
For triangle C remmaing angle is 60° and included side between 50° and 60° is 9.
But for triangle D 9 is the included side between 50° and 70°.
Thus, D is not congruent to the other A, B and C triangles.
