We will discuss here about measuring the line segment i.e. how to draw and measure a line segment using scale or ruler.
We can measure a line segment by two ways.
(i) With the help of scale or ruler only.
(ii) With the help of a pair of dividers and a scale or ruler.
Measuring a line segment with the help of a scale:
Generally, we measure a line segment with the help of a scale which has marking in centimetres (cm) and inches (in). Mostly we measure the line segments in centimetres. Each centimetre is divided into 10 small equal parts, called millimetres (mm).
1 cm. = 10 mm. and 1 mm. = 1/10 cm.
For measuring the length of a line segment AB, we place in
such a way that the end point A of the line segment coincides with 0 mark of
the scale.
We hold the scale properly along the line segment. We read the mark on the scale that coincides with the end point B. Here, we see that the 7th centimetre mark on the scale that coincides with the end point B. Here, we see that the 7th centimetre mark coincides with the end point B. Thus, the length of the line segment AB is 7 cm.
We should take some precautions while measuring a line segment. Sometimes, because of broken corner 0 mark of the scale does not appear. If it is so, we can place any other point centimetre mark of the scale on the end point A and measure the line segment AB by counting from that centimetre mark.
Measuring a line segment with the help of a divider and a scale:
We can use a divider along with a scale to measure a line segment. We open the pair of divider carefully and place the pointed ends of the pair of divider on the both ends of the line segment as shown here. We lift divider very carefully without disturbing its arms.
Now we place its one end on the zero mark of the scale and let its other end rest at a certain mark of the scale as shown here.
Finally, then we read the length.
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