Eg. : Railway track is a fine example for parallel lines.
- Perpendicular lines
If two lines intersect at right angles to each other then they are called perpendicular
lines. In other words, if the angle formed between any two lines is equal to 90o,^ then
the two lines are called as perpendicular lines.
A sheet of paper may be folded twice both horizontally and vertically to form two
halves either way. The creases thus formed will intersect at right angles to each other.
- Skew lines
Lines which lie on different planes and do not meet are called as skew lines. Let the
child be given a box. The lines on the top of the box (which is a plane) are different
from those lines on the bottom of the box. That is, they are on different planes which
do not meet. These lines are called skew lines.
Lines on plane 1 and lines on plane 2 which never meet but parallel are skew lines.
A B
C
D
