The first step number that is not justified and the reason it is not justified:
From the attached image
[tex]<\text{ECF}\cong
Step 1: is said to be correct cause all the range are equivalent and parallel
Step 2: is said to be correct AECF is a parrelologram because it is a quadilateral with two opposite equal sides
Step 3: is correct
[tex]\begin{gathered} \Delta BEC\cong\Delta\text{ECF}\ldots\text{..} \\ \text{parallel lines cut by a transverse form congruent alternate interior angle.} \end{gathered}[/tex]
Step 4: is correct
[tex]<\text{BEC}\congStep 5: is correct [tex]<\text{BEC}\cong
Step 6 : is not correct , because corresponding parts of the congruent triangle are not congruent.
Step 7: is correct , because its a rhombus.
