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DrAWIng An Angle

To draw an angle of 60°, follow the steps given below:
Step 1. Draw a ray AB with the help of a ruler. C

80 90 100
70 90 110
A B 60 120 110 100 80 70 120
50 60 130
40 130 50 140
Step 2. Place the protractor on AB , so that its 30 150 140 40 30 150
centre point is at A and adjust the 20 160 20 160
protractor so that the baseline is along 10 170 10 170 B
0 180 0 180
AB . A
Step 3. Look at the inner and outer scales and check which one has the 0° mark

along AB .
Step 4. Mark a point C on the paper against the 60° mark of the scale. This locates
the position of point C.

Step 5. Now, remove the protractor and join A and C with the C
help of a ruler.
Thus, we have ∠CAB = 60°.

60°

A B
Exercise 5B

1. Write the measures of the following angles by reading the scale on the protractor.

a. b.
80 90 100 80 90 100
70 90 110 70 90 110
60 110 100 80 70 120 60 110 100 80 70 120
50 130 120 60 130 50 130 120 60 130
40 140 50 40 140 40 140 50 40 140
30 150 30 150
150 30 150 30
20 160 20 160 20 160 20 160
10 170 10 170 10 170 10 170
180 0 180 0
0 180 0 180

c. d.
80 90 100 80 90 100
70 90 110 70 90 110
60 110 100 80 70 120 60 110 100 80 70 120
50 120 60 130 50 130 120 60 130
40 130 50 140 40 50 140
140 40 140 40
30 150 30 150 30 150 30 150
20 160 20 160 20 160 20 160
10 170 10 170 10 170 10 170
180 0 0 180 0
0 180 180

110 Mathematics 5