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Construction of a 90 Degree Angle Video Lecture - Class 6
FAQs on Construction of a 90 Degree Angle Video Lecture - Class 6
| 1. How do you construct a 90 degree angle? |  |
Ans. To construct a 90 degree angle, you will need a ruler and a compass. Here are the steps:
1. Draw a straight line segment using a ruler.
2. Place the compass on one end of the line segment and draw an arc that intersects the line.
3. Without changing the compass width, place the compass on the other end of the line segment and draw another arc.
4. Use a ruler to draw a straight line connecting the two points where the arcs intersect.
5. The angle formed by the line segment and the new line is a 90 degree angle.
| 2. What tools are needed to construct a 90 degree angle? | |
Ans. To construct a 90 degree angle, you will need a ruler and a compass. The ruler is used to draw a straight line segment, and the compass is used to draw the arcs that intersect the line segment and form the angle.
| 3. Can I use a protractor to construct a 90 degree angle? | |
Ans. No, a protractor is not used to construct a 90 degree angle. A protractor is a tool used to measure angles, not to construct them. To construct a 90 degree angle, you need to use a ruler and a compass.
| 4. Why is it important to construct a 90 degree angle accurately? | |
Ans. Constructing a 90 degree angle accurately is important because it is a fundamental angle in geometry. Many geometric constructions and measurements rely on the accuracy of a 90 degree angle. If the angle is not constructed correctly, it can lead to errors in subsequent calculations or constructions.
| 5. Are there any shortcuts or alternative methods to construct a 90 degree angle? | |
Ans. Yes, there are alternative methods to construct a 90 degree angle. One method is to use a right angle triangle. By using the Pythagorean theorem, you can construct a right angle triangle with sides in the ratio of 3:4:5. Another method is to use a set square or a carpenter's square, which already has a 90 degree angle built-in. These alternative methods can be useful if you do not have a compass or if you need to construct a 90 degree angle quickly.
Text Transcript from Video
hello friends this video on practical
geometry bar 12 is brought to you by
exam for calm
no more pure from exam how about drawing
a 90 degree now here if you try to
relate 90 degree in some way to 60
degree and 120 degree you would find
that 90 degree lies exactly between 60
degree and 120 degree yes
so you see 60 degree 70 degree 80 degree
90 degree hundred degree hundred ten
degree hundred twenty degree so if you
see from 61 to three jumps you reach
ninety from 121 to three jumps you reach
ninety so ninety is exactly midway
between 60 and 120 so it is very easy to
draw a 90 degree but for this also you
first need to draw a 60 then a 120 and
only then you will be able to draw a 90
let's see how so to draw a 60 degree
this is going to be a quick recap for
you first you consider point O as the
center draw an arc of convenient radius
this art would intersect the line at
some point in now with a as the center
draw an arc of the same radius so these
two arts would intersect at some point B
so join points o and P so you get a 60
degree perfect now how about 120 degree
keeping the same radius of the compass
but this time B has the center draw
another arc so you would see that this
new arc also intersects the existing arc
at some point C so if you join points o
and C you get a 120 degree so this angle
is 60 degree this angle is 120 degree
now how about 90 degree so 90 degree has
to lie somewhere
between 60 and 120 in fact it has to lie
exactly between 60 and 90 60 and 120 so
we will actually bisect this angle so
that we can find out the exact midpoint
of these two angles and how do we draw
angle bisectors so one point one
endpoint is B and one endpoint is C so
taking B as the center and radius
slightly more than half of BC we draw an
arc like this similarly taking C as the
center and radius slightly more than
half of BC we draw another arc now we
see that these two arc they intersect at
a point so let's call this point as E so
now we join point e 2.0 so this angle is
90 degree because this angle is the
angle bisector of this angle so angle
bisector of one twin I mean it lies
exactly in between 60 and 120 degree so
that's how we have found we have learned
how do we draw a 90 degree using the
ruler compass construction thank you
please visit exam fee or come for free
quality education you can learn with a
simple four-step learning process
wherein you can watch video lessons you
can ask your questions you can refer
notes and you can take a free online
test we have content for class 6 to 12
on physics chemistry mathematics and
biology along with practical videos so
please subscribe to our channel for
daily updates thank you
geometry bar 12 is brought to you by
exam for calm
no more pure from exam how about drawing
a 90 degree now here if you try to
relate 90 degree in some way to 60
degree and 120 degree you would find
that 90 degree lies exactly between 60
degree and 120 degree yes
so you see 60 degree 70 degree 80 degree
90 degree hundred degree hundred ten
degree hundred twenty degree so if you
see from 61 to three jumps you reach
ninety from 121 to three jumps you reach
ninety so ninety is exactly midway
between 60 and 120 so it is very easy to
draw a 90 degree but for this also you
first need to draw a 60 then a 120 and
only then you will be able to draw a 90
let's see how so to draw a 60 degree
this is going to be a quick recap for
you first you consider point O as the
center draw an arc of convenient radius
this art would intersect the line at
some point in now with a as the center
draw an arc of the same radius so these
two arts would intersect at some point B
so join points o and P so you get a 60
degree perfect now how about 120 degree
keeping the same radius of the compass
but this time B has the center draw
another arc so you would see that this
new arc also intersects the existing arc
at some point C so if you join points o
and C you get a 120 degree so this angle
is 60 degree this angle is 120 degree
now how about 90 degree so 90 degree has
to lie somewhere
between 60 and 120 in fact it has to lie
exactly between 60 and 90 60 and 120 so
we will actually bisect this angle so
that we can find out the exact midpoint
of these two angles and how do we draw
angle bisectors so one point one
endpoint is B and one endpoint is C so
taking B as the center and radius
slightly more than half of BC we draw an
arc like this similarly taking C as the
center and radius slightly more than
half of BC we draw another arc now we
see that these two arc they intersect at
a point so let's call this point as E so
now we join point e 2.0 so this angle is
90 degree because this angle is the
angle bisector of this angle so angle
bisector of one twin I mean it lies
exactly in between 60 and 120 degree so
that's how we have found we have learned
how do we draw a 90 degree using the
ruler compass construction thank you
please visit exam fee or come for free
quality education you can learn with a
simple four-step learning process
wherein you can watch video lessons you
can ask your questions you can refer
notes and you can take a free online
test we have content for class 6 to 12
on physics chemistry mathematics and
biology along with practical videos so
please subscribe to our channel for
daily updates thank you
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Sep 25, 2025
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