We will discuss here about constructing a line segment. We know how to draw a line segment of a certain length. Suppose we want to draw a line segment of 4.5 cm length.
We follow the following steps as given below:
Step I: We place a scale on a paper sheet as shown below.
Step II: We place the sharp point of a pencil on the point which coincides with 0 on the scale and name it as A.
Step III: We mark another point B which coincides with the fifth millimetre division after the 4th centimetre. (1 small division = 1 mm.)
Step IV: We join both points A and B by drawing a line segment with a fine pointed pencil. The line segment AB is of 4.5 cm length.
Drawing a Line Segment:
Now, let us learn how to draw a line segment of a given length.
Step I: Place the ruler on the paper. Then mark two points P and Q against the marks 0 and 9 of the scale.
Step II: Keeping the scale evenly, move the pencil from P to Q along the edge of the scale. The line segment PQ is of length 9 cm.
Questions and Answers on Constructing a Line Segment
I. Draw line segments of the following lengths using the ruler:
(i) 9 cm
(ii) 3 cm
(iii) 10 cm
(iv) 5 cm
(v) 7 cm
II. Draw two lines segments PQ and QR of length 4 cm each such that they meet at point Q. Measure the length of line segment PR.