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# Geometrical Constructions Exercise 19.4 Class 6 Notes | EduRev

## Class 6 : Geometrical Constructions Exercise 19.4 Class 6 Notes | EduRev

``` Page 1

1. Construct the following angles with the help of a protractor:
45
o
, 67
o
, 38
o
, 110
o
, 179
o
, 98
o
, 84
o

Solution:

Construct a ray OA.
Now place the protractor on the ray OA such that its centre coincides with point O and the diameter coincides
with OA.
Mark a point B against the mark of 45
o
on the protractor.
Remove the protractor and construct the line OB where ?AOB is the required angle.

In the same way draw the angles 67
o
, 38
o
, 110
o
, 179
o
, 98
o
and 84
o

Page 2

1. Construct the following angles with the help of a protractor:
45
o
, 67
o
, 38
o
, 110
o
, 179
o
, 98
o
, 84
o

Solution:

Construct a ray OA.
Now place the protractor on the ray OA such that its centre coincides with point O and the diameter coincides
with OA.
Mark a point B against the mark of 45
o
on the protractor.
Remove the protractor and construct the line OB where ?AOB is the required angle.

In the same way draw the angles 67
o
, 38
o
, 110
o
, 179
o
, 98
o
and 84
o

2. Draw two rays PQ and RS as shown in Fig. 19.14 (i) and (ii). Using protractor, construct angles of 15
o

and 138
o
with one arm PQ and RS respectively.

Solution:

(i) Construct a ray PQ as given in the question.
Now place the protractor on PQ such that its centre coincides with the point P and the diameter coincides with
PQ.
Mark B against the mark of 15
o
on the protractor.
Construct PB by removing the protractor.

Page 3

1. Construct the following angles with the help of a protractor:
45
o
, 67
o
, 38
o
, 110
o
, 179
o
, 98
o
, 84
o

Solution:

Construct a ray OA.
Now place the protractor on the ray OA such that its centre coincides with point O and the diameter coincides
with OA.
Mark a point B against the mark of 45
o
on the protractor.
Remove the protractor and construct the line OB where ?AOB is the required angle.

In the same way draw the angles 67
o
, 38
o
, 110
o
, 179
o
, 98
o
and 84
o

2. Draw two rays PQ and RS as shown in Fig. 19.14 (i) and (ii). Using protractor, construct angles of 15
o

and 138
o
with one arm PQ and RS respectively.

Solution:

(i) Construct a ray PQ as given in the question.
Now place the protractor on PQ such that its centre coincides with the point P and the diameter coincides with
PQ.
Mark B against the mark of 15
o
on the protractor.
Construct PB by removing the protractor.

Here ?QPB is the required angle of 15
o
.

(ii) Construct a ray RS as given in the question.
Now place the protractor on RS such that its centre coincides with the point R and the diameter coincides with
RS.
Mark T against the mark of 138
o
on the protractor.
Construct ST by removing the protractor.

Here ?RST is the required angle of 138
o
.

```
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## Mathematics (Maths) Class 6

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