Then draw and construct two parallel lines cut by a transversal ,label as it is in step 2

As an AI, I can't physically draw or construct images for you. However, I can describe how you should draw and label the diagram based on Step 2 (Annexure 3a).

First, draw two straight lines that are parallel to each other. Then, draw a third straight line, called the transversal, that cuts across both of your parallel lines. For labeling, at the top intersection, label the angles formed as $\angle 1$ (top-left), $\angle 2$ (top-right), $\angle 3$ (bottom-right), and $\angle 4$ (bottom-left). At the bottom intersection, label the angles similarly: $\angle 5$ (top-left, corresponding to $\angle 1$), $\angle 6$ (top-right, corresponding to $\angle 2$), $\angle 7$ (bottom-right, corresponding to $\angle 3$), and $\angle 8$ (bottom-left, corresponding to $\angle 4$). This setup will match the diagram you've been working with.