See if the distance between the two lines is consistent with a compass.
Make sure the lines intersect at right angles with the corner of a piece of paper.
Measure each of the angles with a straightedge.
There is no way to ensure you have constructed parallel lines.
The anwser to your question is 1 and 5/7
There is no picture or diameter/radius measurements, therefore this question cannot be answered properly.
I'd say 4 meters and 400dm are equal.
