Question

Which two lanes are parallel

1. p || q
2. r || s
3. q || r
4. p || r

Answer 1

4

Explanation:

1p:80°-140。＝40°，40°

Answer 2

1. Line p is parallel to line q
In the figure, we see that line p crosses transversal n at 140 degrees. This means that it’s supplementary angle must be 40 degrees, as 140 and 40 add to 180. The supplementary angle on line p is congruent to the angle in line q, which we know to be 40 degrees. Therefore, p and q cross the transversal at the same angle, therefore they are parallel.