Page 205 - Maths Class 06

9. Draw a line segment of length 9.2 cm. Construct its perpen dic u lar bisec tor. Measure the two parts
in which the perpendicular bisector divides the line segment. What do you observe?
10. Draw a line segment AB of length 10 cm. Draw perpen dic u lars at the end points of AB. Are these
two lines parallel?

11. Draw any line segment AB. Take a point P not on it. Through P, draw a perpen dic u lar to AB using
a ruler and compass only.

12. Draw a line segment of length 8 cm. Use a ruler and compass to construct a perpen dic u lar on a
point P lying on the line segment 3 cm from one end.

Drawing of An Angle Using a Protractor
¾®
Let us draw and angle ABC of 30° with the help of protractor. To draw ÐABC, first draw a ray BC on a
paper.

B C
Fig. 14.32

Now, place the protractor in such a way that the midpoint of the base line coincides with point B [see Fig.
¾® ¾®
14.33 (a)] and base line overlaps exactly with ray BC of the angle. Since BC lies to the right of the midpoint
of the base line, hence start reading the angles on the inner circle from zero degree and mark at 30° as point A.
Now remove the protractor and join point A and B. ÐABC is the required angle of 30° [See Fig. 14.33 (b)].

70 80 90 100 110 A
60 100 80 120
50 120 110 70 60 130
40 130 50 140 A
30 140 40 30 150
20 160 150 20 160
10 170 10 170
0 180 O 0 180 C 30°
B B C
Fig. 14.33(a) Fig. 14.33(b)

NOTE
If ray BC lies to the left of the midpoint of the base line, start 110 100 90 80
120
reading the angle on the outer circle from zero and mark at 30° A 30 40 50 60 70 80 70 60 50 140
100 110 120 130
130
as point A. Join A and B Ð ABC is the required angle of 30°. 20 160 150 140 40 30 20 150 160
10 170 10 170
C 0 180 O 0 180
B
Drawing of an Angle Using a Ruler and a Pair of Compasses

To Draw an Angle Equal to a Given Angle C
Given : An an gle CAB.
To con struct : An an gle RPQ equal to ÐCAB.

A B
Fig. 14.34

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