Answer:
The given construction is illustrating parallel lines.
Explanation:
In the given figure ,
1) Let it be Δ ABC with base BC.
2) Mark point D on side AB.
3) Taking B as point to draw an angle and with same measurement draw an arc at point D.
4) Extend D to join AC at point E such that ∠ ADE = ∠ABC
these are corresponding angles .
Therefore, DE ║ BC
We obtained a line DE parallel to BC.
Thus, the given construction is illustrating parallel lines.