Videos > How to construct angles 105 120 135 150 degrees - Compass
How to construct angles 105 120 135 150 degrees - Compass Video Lecture
FAQs on How to construct angles 105 120 135 150 degrees - Compass Video Lecture
| 1. How do I construct a 105-degree angle using a compass? |  |
Ans. To construct a 105-degree angle using a compass, follow these steps:
1. Draw a ray (line) with a starting point called the vertex.
2. Place the pointed end of the compass at the vertex and draw an arc that intersects the ray.
3. Without changing the compass width, place the pointed end at the intersection point of the arc and the ray.
4. Draw another arc that intersects the first arc.
5. Finally, draw a straight line connecting the vertex and the intersection point of the two arcs. This line forms a 105-degree angle with the ray.
| 2. How can I construct a 120-degree angle using a compass? | |
Ans. To construct a 120-degree angle using a compass, follow these steps:
1. Draw a ray (line) with a starting point called the vertex.
2. Place the pointed end of the compass at the vertex and draw an arc that intersects the ray.
3. Without changing the compass width, place the pointed end at the intersection point of the arc and the ray.
4. Draw another arc that intersects the first arc.
5. Finally, draw a straight line connecting the vertex and the intersection point of the two arcs. This line forms a 120-degree angle with the ray.
| 3. What is the process to construct a 135-degree angle using a compass? | |
Ans. To construct a 135-degree angle using a compass, follow these steps:
1. Draw a ray (line) with a starting point called the vertex.
2. Place the pointed end of the compass at the vertex and draw an arc that intersects the ray.
3. Without changing the compass width, place the pointed end at the intersection point of the arc and the ray.
4. Draw another arc that intersects the first arc.
5. Finally, draw a straight line connecting the vertex and the intersection point of the two arcs. This line forms a 135-degree angle with the ray.
| 4. Can you explain how to construct a 150-degree angle using a compass? | |
Ans. To construct a 150-degree angle using a compass, follow these steps:
1. Draw a ray (line) with a starting point called the vertex.
2. Place the pointed end of the compass at the vertex and draw an arc that intersects the ray.
3. Without changing the compass width, place the pointed end at the intersection point of the arc and the ray.
4. Draw another arc that intersects the first arc.
5. Finally, draw a straight line connecting the vertex and the intersection point of the two arcs. This line forms a 150-degree angle with the ray.
| 5. Are there any shortcuts or tips for constructing angles using a compass? | |
Ans. Yes, here are some tips for constructing angles using a compass:
- Ensure that the compass remains fixed at the same width throughout the construction process.
- Use a sharp pencil or pen to draw clear arcs.
- To improve accuracy, you can measure and mark the desired angle before starting the construction.
- Practice constructing angles of known measurements first to become more comfortable with the process.
- Take your time and double-check the accuracy of your construction before finalizing the angle.
Text Transcript from Video
[Music]
[Music]
hello everyone welcome to the next
lecture on the series how to draw angles
in the last one we discussed how to make
acute angles like 30 degrees 45 degrees
60 degree and right angle 90 degree in
this part we are going to discuss how to
draw angles which are obtuse now like
105 degrees 120 degree 135 degrees and
150 degrees but let's start and discuss
them so what all do we need to make
concessions
we need a scale a D to measure angles
very well shaft intensive a good rubber
sharpener and of course a compass to
make angles
let's first discuss how to make angle
all 120 degrees just like we discuss 60
degree is the basic angle in a cube
angles
120 degree is the basic most angle and
of user angles first you learn how to
make the same draw a straight line
give any point mean a from where you
want to talk The Advocate take compass
open it a bit put your compass on this
point and draw an arc now please
remember don't open your compass very
big because it will make difficult for
you only to draw the angle we make this
arc now from the basic most point
starting on the right-hand side I draw
this arc the compass remains open from
this angle and this is the point of 60
degree from this point of 60 degree I'll
make another arc on this main arc this
up my friends is up of 120 degrees now
this point and our base point we join
these two points and draw an elongated
line from this point this is an angle of
120 degrees let's have it look see this
is an angle of 120 degrees now next we
move forward to making of 105 degrees
hundred and five
[Music]
105 degrees if you people think over is
the middle point the bisector of two
angles 90 degree and 120 first of all we
draw a line mark a point up there first
we are going to make an angle of 120
degrees only
opened up your arc now on this arc just
like the previous construction we are
going to make an angle of 120 degrees
this is 60 now from 60 I may can handle
[Music]
this is 120 degrees I joined these two
points and draw an elongated line this
will be my 120 degrees now I say hundred
and five is what bisector of 1920
therefore in this very construction I
have to make 90 degrees also first and
then will bisect the angle now to make
an angle of 90 degrees
open up your compass a bit move from 120
degree point draw an arc from 60 degree
point though another arc now this point
of meeting of those two hours and this
point base point we join together this
is my angle of 90 degrees now what I
have to do is I have to construct an
angle between these two angles so that
means opening up my compass from this
point
[Music]
120 degrees 120 degrees I draw an arc
from this 90 degree point
[Music]
I draw another up but these two arcs
meet at this one this is the
intersecting point of these blue ox what
I do and draw a line from this point
this will be my hundred and five degrees
angle let's have a look
now if you see this is 405 degrees and
[Music]
next we move forward 250 degrees angle
[Music]
hundred and fifty degrees is right
between one hundred and twenty degrees
at hundred and fifty eight hundred and
eighty degrees is the easiest able to
make because it's a straight head so
what we are going to do here we draw a
line take a point over here we open up a
compass of it and we draw an arc we do a
full up
now on this from this base point
we draw a 60-degree from the 60-degree
point we draw another arc this is
hundred and twenty
now this is my 100 and if we start from
here this is my hundred and eighty
degrees and this is hundred and twenty
degrees I have to make my scepter of
these two angles which will go
approximately from here and that will be
150 degrees what I do first of all I'll
open up my arc compress of it from 180
degree I draw a line
I draw and up not from this hundred and
twenty degrees point I draw in a clock
this is their point of intersection so
120 degree and hundred and eighty
degrees from the base point I draw a
line passing through this point this is
my angle of hundred and such a degree
guys let's have a look if you see now
this is perfect
150 degrees moving to the top and which
is 135 degrees hundred and thirty-five
this light between 120 and 150 degrees
and so here from this point first we
have to make hundred fifty degree lambda
and then we'll be bisecting 120 degree
and 150 degrees now they open up your
compass going up from the base point
first up we know this first up is of 60
degrees from this point
we draw another rock you know this art
is what makes people so 120 and 180 for
support let's bisect these two arcs open
up your compass a bit more
[Music]
the dog first up from this point 150
degree wheel or another I got this point
joining making a line from the base us
into this point this is my bunch of
greedy weeks now I have to make an angle
between 120 and 150 135 which will be
passing Sun with approximately on this
part I have to make an angle of 135
degrees which is approximately between
this 120 degree and 150 degree angle so
the parts will be approximately here
what are you doing
I'll make bisector and the top 150 in
what way how from much of peak degree
line I mean an arc like this don't 120
degree I make another arc
to make one more up for one thing
now the point of intersection of these
two axes this point when I draw a line
from the base point passing through this
point it goes something like this
if I see on the country on the deal
this is my perfect Hamlet hundred and
thirty-five degrees my friends I hope
you learn how to construct these angles
see you soon with the next lesson thank
you
[Music]
[Music]
hello everyone welcome to the next
lecture on the series how to draw angles
in the last one we discussed how to make
acute angles like 30 degrees 45 degrees
60 degree and right angle 90 degree in
this part we are going to discuss how to
draw angles which are obtuse now like
105 degrees 120 degree 135 degrees and
150 degrees but let's start and discuss
them so what all do we need to make
concessions
we need a scale a D to measure angles
very well shaft intensive a good rubber
sharpener and of course a compass to
make angles
let's first discuss how to make angle
all 120 degrees just like we discuss 60
degree is the basic angle in a cube
angles
120 degree is the basic most angle and
of user angles first you learn how to
make the same draw a straight line
give any point mean a from where you
want to talk The Advocate take compass
open it a bit put your compass on this
point and draw an arc now please
remember don't open your compass very
big because it will make difficult for
you only to draw the angle we make this
arc now from the basic most point
starting on the right-hand side I draw
this arc the compass remains open from
this angle and this is the point of 60
degree from this point of 60 degree I'll
make another arc on this main arc this
up my friends is up of 120 degrees now
this point and our base point we join
these two points and draw an elongated
line from this point this is an angle of
120 degrees let's have it look see this
is an angle of 120 degrees now next we
move forward to making of 105 degrees
hundred and five
[Music]
105 degrees if you people think over is
the middle point the bisector of two
angles 90 degree and 120 first of all we
draw a line mark a point up there first
we are going to make an angle of 120
degrees only
opened up your arc now on this arc just
like the previous construction we are
going to make an angle of 120 degrees
this is 60 now from 60 I may can handle
[Music]
this is 120 degrees I joined these two
points and draw an elongated line this
will be my 120 degrees now I say hundred
and five is what bisector of 1920
therefore in this very construction I
have to make 90 degrees also first and
then will bisect the angle now to make
an angle of 90 degrees
open up your compass a bit move from 120
degree point draw an arc from 60 degree
point though another arc now this point
of meeting of those two hours and this
point base point we join together this
is my angle of 90 degrees now what I
have to do is I have to construct an
angle between these two angles so that
means opening up my compass from this
point
[Music]
120 degrees 120 degrees I draw an arc
from this 90 degree point
[Music]
I draw another up but these two arcs
meet at this one this is the
intersecting point of these blue ox what
I do and draw a line from this point
this will be my hundred and five degrees
angle let's have a look
now if you see this is 405 degrees and
[Music]
next we move forward 250 degrees angle
[Music]
hundred and fifty degrees is right
between one hundred and twenty degrees
at hundred and fifty eight hundred and
eighty degrees is the easiest able to
make because it's a straight head so
what we are going to do here we draw a
line take a point over here we open up a
compass of it and we draw an arc we do a
full up
now on this from this base point
we draw a 60-degree from the 60-degree
point we draw another arc this is
hundred and twenty
now this is my 100 and if we start from
here this is my hundred and eighty
degrees and this is hundred and twenty
degrees I have to make my scepter of
these two angles which will go
approximately from here and that will be
150 degrees what I do first of all I'll
open up my arc compress of it from 180
degree I draw a line
I draw and up not from this hundred and
twenty degrees point I draw in a clock
this is their point of intersection so
120 degree and hundred and eighty
degrees from the base point I draw a
line passing through this point this is
my angle of hundred and such a degree
guys let's have a look if you see now
this is perfect
150 degrees moving to the top and which
is 135 degrees hundred and thirty-five
this light between 120 and 150 degrees
and so here from this point first we
have to make hundred fifty degree lambda
and then we'll be bisecting 120 degree
and 150 degrees now they open up your
compass going up from the base point
first up we know this first up is of 60
degrees from this point
we draw another rock you know this art
is what makes people so 120 and 180 for
support let's bisect these two arcs open
up your compass a bit more
[Music]
the dog first up from this point 150
degree wheel or another I got this point
joining making a line from the base us
into this point this is my bunch of
greedy weeks now I have to make an angle
between 120 and 150 135 which will be
passing Sun with approximately on this
part I have to make an angle of 135
degrees which is approximately between
this 120 degree and 150 degree angle so
the parts will be approximately here
what are you doing
I'll make bisector and the top 150 in
what way how from much of peak degree
line I mean an arc like this don't 120
degree I make another arc
to make one more up for one thing
now the point of intersection of these
two axes this point when I draw a line
from the base point passing through this
point it goes something like this
if I see on the country on the deal
this is my perfect Hamlet hundred and
thirty-five degrees my friends I hope
you learn how to construct these angles
see you soon with the next lesson thank
you
[Music]
About this Video
Oct 06, 2025
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