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# Basic Geometrical Tools Exercise 18.1 Class 6 Notes | EduRev

## Class 6 : Basic Geometrical Tools Exercise 18.1 Class 6 Notes | EduRev

``` Page 1

1. Construct the following angles using set-squares:
(i) 45
0

(ii) 90
0

(iii) 60
0

(iv) 105
0

(v) 75
0

(vi) 150
0

Solution:

(i) Now place 45
0
using set square. Construct two rays AB and AC along the edges from the vertex A of 45
0
angle
of the set square. So the angle formed is 45
0

Hence, ?BAC = 45
0

(ii) Now place 90
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 90
0

angle of the set square. So the angle formed is 90
0

Hence, ?ABC = 90
0

g
(iii) Now place 60
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 60
0

angle of the set square. So the angle formed is 60
0

Hence, ?ABC = 60
0

Page 2

1. Construct the following angles using set-squares:
(i) 45
0

(ii) 90
0

(iii) 60
0

(iv) 105
0

(v) 75
0

(vi) 150
0

Solution:

(i) Now place 45
0
using set square. Construct two rays AB and AC along the edges from the vertex A of 45
0
angle
of the set square. So the angle formed is 45
0

Hence, ?BAC = 45
0

(ii) Now place 90
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 90
0

angle of the set square. So the angle formed is 90
0

Hence, ?ABC = 90
0

g
(iii) Now place 60
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 60
0

angle of the set square. So the angle formed is 60
0

Hence, ?ABC = 60
0

(iv) Now place 30
0
using set square and make an angle 60
0
. Construct two rays BA and BC as given in figure.

Place the set square of angle 45
0
of the set-square on the ray BA and draw the ray BD. So the angle formed is
105
0
.
Hence, ?DBC = 105
0

(v) Now place 45
0
using set square and make an angle 45
0
. Construct two rays BC and BD as shown in figure.
Page 3

1. Construct the following angles using set-squares:
(i) 45
0

(ii) 90
0

(iii) 60
0

(iv) 105
0

(v) 75
0

(vi) 150
0

Solution:

(i) Now place 45
0
using set square. Construct two rays AB and AC along the edges from the vertex A of 45
0
angle
of the set square. So the angle formed is 45
0

Hence, ?BAC = 45
0

(ii) Now place 90
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 90
0

angle of the set square. So the angle formed is 90
0

Hence, ?ABC = 90
0

g
(iii) Now place 60
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 60
0

angle of the set square. So the angle formed is 60
0

Hence, ?ABC = 60
0

(iv) Now place 30
0
using set square and make an angle 60
0
. Construct two rays BA and BC as given in figure.

Place the set square of angle 45
0
of the set-square on the ray BA and draw the ray BD. So the angle formed is
105
0
.
Hence, ?DBC = 105
0

(v) Now place 45
0
using set square and make an angle 45
0
. Construct two rays BC and BD as shown in figure.

Place the vertex of 30
0
of the set square on the ray BD and draw the ray BA. So the angle formed is 75
0

Hence, ?ABC = 75
0
.

(vi) Now place the vertex of 45
0
of the set square and make an angle 90
0
and construct two rays BD and BC as
shown in figure.

Place the vertex of 30
0
of the set square on the ray BC and draw the ray BA. So the angle formed is 150
0

Page 4

1. Construct the following angles using set-squares:
(i) 45
0

(ii) 90
0

(iii) 60
0

(iv) 105
0

(v) 75
0

(vi) 150
0

Solution:

(i) Now place 45
0
using set square. Construct two rays AB and AC along the edges from the vertex A of 45
0
angle
of the set square. So the angle formed is 45
0

Hence, ?BAC = 45
0

(ii) Now place 90
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 90
0

angle of the set square. So the angle formed is 90
0

Hence, ?ABC = 90
0

g
(iii) Now place 60
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 60
0

angle of the set square. So the angle formed is 60
0

Hence, ?ABC = 60
0

(iv) Now place 30
0
using set square and make an angle 60
0
. Construct two rays BA and BC as given in figure.

Place the set square of angle 45
0
of the set-square on the ray BA and draw the ray BD. So the angle formed is
105
0
.
Hence, ?DBC = 105
0

(v) Now place 45
0
using set square and make an angle 45
0
. Construct two rays BC and BD as shown in figure.

Place the vertex of 30
0
of the set square on the ray BD and draw the ray BA. So the angle formed is 75
0

Hence, ?ABC = 75
0
.

(vi) Now place the vertex of 45
0
of the set square and make an angle 90
0
and construct two rays BD and BC as
shown in figure.

Place the vertex of 30
0
of the set square on the ray BC and draw the ray BA. So the angle formed is 150
0

Hence, ?ABC = 150
0

2. Given a line BC and a point A on it, constructed a ray AD using set squares so that ?DAC is
(i) 30
0

(ii) 150
0

Solution:

(i) Construct a line BC and mark a point A on it. Now place a 30
0
set square on the line BC where its vertex of 30
0

angle lies on point A and one edge coincides with the ray AB as shown in figure. Construct the ray AD.

Hence, the required ?DAC = 30
0

(ii) Construct a line BC and mark a point A on it. Now place 30
0
set square on the line BC where its vertex of 30
0

lies on point A and one edge coincides with the ray AB as shown in figure. Construct the ray AD
Hence, ?DAB = 30
0

Page 5

1. Construct the following angles using set-squares:
(i) 45
0

(ii) 90
0

(iii) 60
0

(iv) 105
0

(v) 75
0

(vi) 150
0

Solution:

(i) Now place 45
0
using set square. Construct two rays AB and AC along the edges from the vertex A of 45
0
angle
of the set square. So the angle formed is 45
0

Hence, ?BAC = 45
0

(ii) Now place 90
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 90
0

angle of the set square. So the angle formed is 90
0

Hence, ?ABC = 90
0

g
(iii) Now place 60
0
using set square. Construct two rays BC and BA along the edges from the vertex B of 60
0

angle of the set square. So the angle formed is 60
0

Hence, ?ABC = 60
0

(iv) Now place 30
0
using set square and make an angle 60
0
. Construct two rays BA and BC as given in figure.

Place the set square of angle 45
0
of the set-square on the ray BA and draw the ray BD. So the angle formed is
105
0
.
Hence, ?DBC = 105
0

(v) Now place 45
0
using set square and make an angle 45
0
. Construct two rays BC and BD as shown in figure.

Place the vertex of 30
0
of the set square on the ray BD and draw the ray BA. So the angle formed is 75
0

Hence, ?ABC = 75
0
.

(vi) Now place the vertex of 45
0
of the set square and make an angle 90
0
and construct two rays BD and BC as
shown in figure.

Place the vertex of 30
0
of the set square on the ray BC and draw the ray BA. So the angle formed is 150
0

Hence, ?ABC = 150
0

2. Given a line BC and a point A on it, constructed a ray AD using set squares so that ?DAC is
(i) 30
0

(ii) 150
0

Solution:

(i) Construct a line BC and mark a point A on it. Now place a 30
0
set square on the line BC where its vertex of 30
0

angle lies on point A and one edge coincides with the ray AB as shown in figure. Construct the ray AD.

Hence, the required ?DAC = 30
0

(ii) Construct a line BC and mark a point A on it. Now place 30
0
set square on the line BC where its vertex of 30
0

lies on point A and one edge coincides with the ray AB as shown in figure. Construct the ray AD
Hence, ?DAB = 30
0

We know that the angle on one side of the straight line will always add to 180
0

So we get ?DAB + ?DAC = 180
0

Hence, ?DAC = 150
0

```
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## Mathematics (Maths) Class 6

191 videos|220 docs|43 tests

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