Page 203 - New Medley 4 Semester 1

Polygon: A closed shape formed with only line segments is called a polygon.
A polygon can have three or more line segments.

Measuring and Drawing Line Segment

Measuring a Line Segment

We can measure the length of a line segment using a ruler accurately.
Let us see an example.

To measure the line segment PQ, we put the ruler along it in such a way
that point P coincides with 0 mark. Now, we observe that the point Q

coincides with the mark 8 on the ruler. So, the length of the line segment
PQ is 8 cm.

P Q

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SCALE 2 1 Inches 0
Centimetres

4
6
5
3
We can also measure a line segment that does not have its length in
exact centimetres. Each cm on the ruler is further divided into 10 equal

divisions. Each small division is called 1 mm. So, count the small divisions

after the exact centimetre mark and write them in mm.

Let us measure the length of the line segment XY.

X Y ← Point Y coincides with 3rd division

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SCALE 2 1 Inches 0
Centimetres
6
3
5
4
Thus, the length of the line segment XY is 7 cm 3 mm or 7.3 cm.

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