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10. In the figure given below,

P
K M
A B
C D
E N F
Q L

(a) Is line PQ perpendicular to CD? Justify your answer.
(b) Name the pairs of parallel lines.

(c) Identify the concurrent lines.

11. In the given figure, label any parallel lines with arrows and perpendicular lines with

(a) (b) (c) (d)

More About Line Segments

We know that a line segment has two end points and a definite length. So, it can be compared and
measured. The distance between the two end points of a line segment is called its length, which
can be measured in millimetres (mm), centimetres (cm), metres (m), or any suitable unit of length.

Comparing Line Segments

When we are given two line segments, we find a relation between their lengths to compare them.
We use different methods to compare the given line segments.
Comparison by Observation

Sometimes, two line segments can be compared just by observing them.

Consider the line segments AB and CD shown here. By B C
looking at both line segments, we can say that AB is longer
than CD. A D

However, this kind of comparison is not always accurate. Sometimes the difference between the
lengths of two segments may be very small. Thus, we need a more accurate method to compare
line segments.
Comparison by Tracing Paper

Consider the following line segments:

B P

A Q

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