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line

A line is a straight one-dimensional figure with no thickness. If we fold
a piece of paper, the crease shows a line.

A line can extend indefinitely in both directions. Line
Line AB in the figure is written as AB . A B

types of lines

There are two types of lines:

1. Straight line 2. Curved line.

When you hold a piece of thread tightly, you get a straight line.
A straight line can be horizontal, vertical or slanting.

When you hold a piece of thread loosely, you get a curved line.

Straight Lines Be Aware
Horizontal Vertical Slanting Curved Lines • We can draw many
lines from a single O
point.
• From two given points,
only one straight line P Q
can pass.
line segment

A line segment is a part of a line. It has a fixed length. In
the given figure, AB is a line on which P and Q are any two A P Q B

points. After removing the extra parts beyond P and Q, it forms a line segment PQ.

Line segment PQ or QP is written as PQ or QP or simply PQ, where P P Q
and Q are the endpoints of the line segment.

The edge of your notebook, ruler, etc. are some examples of line segments. A line
segment is a part of a line. A line has no endpoints and it has no fixed length, whereas a

line segment has two endpoints and a fixed length.

Fast Check
Fast Check
1. Wh ich p a th is the sh ort es t r out e t o g o fr om Curved path 1
• Which path is the shortest route to go from
poin t X t o poin
point X to point Y. ________t Y? ________
X Y
2. Th e s h or t es t p a t h b e t w een X a n d Y i s kn o w n a s
• The shortest path between X and Y is known as
a ___________. Straight path
a ___________.
Curved path 2

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