Which construction is illustrated above?

The given construction is illustrating parallel lines.

Step-by-step 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.

is only a line? i think so

start with a line segment pq that we will copy. mark a point r that will be one endpoint of the new line segment. set the compasses' point on the point p of the line segment to be copied. adjust the compasses' width to the point q. the compasses' width is now equal to the length of the line segment pq.

step-by-step explanation: