Question

Which of the following pair of lines have same direction?

• A. Intersecting lines
• B. Coincident lines
• C. Parallel lines
• D. (b) and (c) above.

Answer 1

The correct option is D (b) and (c) above.

Let's discuss all the options one by one:
$\underset{–}{\text{Intersecting Lines:}}$
Lines that cross each other at one point are known as intersecting lines. As depicted in below figure,
Therefore, intersecting lines intersect at only one point and they have different direction.

$\underset{–}{\text{Coincident Lines:}}$
Lines that have infinite points of intersection or coincide with each other are called coincident lines.

In above figure, two lines coincide one over the other and hence they have same direction.

$\underset{–}{\text{Parallel Lines:}}$
Lines that do not intersect or are in same direction are known as parallel lines. As depicted in picture below,
Therefore, parallel line have same direction.

Hence, option (d.) is the correct one.