Learning Types of Angles using a Clock Video Lecture | Mathematics for Class 6

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in the way relevant to this is a name
given to the angle 90 degrees so
whenever the angle between two a is 90
degree we call it a right angle now
there is another way of defining a right
angle it is that angle which corresponds
to one water of a revolution that means
you rotate something you rotate a
Rayleigh only by one quarter of a
revolution one quarter is nothing but
one fourth so got one complete rotation
just one part out of the four parts of
one revolution so one revolution is
lecture you started rotation from here
and you completed one revolution here
right so one for top dish so 1/4 of this
would be only this part so you see only
1/4 of a revolution that is a right
angle so it corresponds to ninety
degrees so this is the name that is
given to this particular value of the
angle similarly you have something as
straight angle straight because this
angle is formed on a straight line now
what is the straight line this is a
straight line so this angle is 180
degree so the angles the name given to
the angle corresponding to 180 degrees
is straight add them because it forms a
straight line the question is how much
of a revolution is 180 degree it is one
half of a revolution so one half of a
revolution corresponds to a straight
angle that is 180 degree and finally we
have complete and will complete that
means one complete revolution so one
complete revolution would correspond to
how many degrees
yes it would correspond to 360 degree
that means you start from here and you
come back to the same position so that
is 360 degree and this is called of
each angle so it is very easy to
remember completely view completed one
revolution so it is complete angles
360-degree triangle means it forms the
straight lines to 180 degree right angle
so here in the speed because you just
covered one force or one water of the
revolution so these are the three names
which are given to three specific angles
90 degree 180 degree and 360 degrees now
let's take the example of the clock to
see the application of each of these
angle hasn't ever all know how time
changes and the clock it's 3 o clock
right now so what is the angle between
the minute and the our hands of the
clock if you see the angle is a right
angle that is 90 degrees between these
two now let's say that as time passes by
you often reach the valley like this how
what is the time now it's 6 over and
what has happened now now this hand of
the clock has actually located further
so I nearly completed only 1/4 of the
revolution now is completed half of the
revolution so it has formed a straight
angle now again as time passes by what
happens from 6 o clock it becomes 9 o
clock right so from 6 to 9 making what
happens in this case this hand of the
clock has actually covers 3/4 of the
revolution if you look at it now it will
gradually this angle is increasing so
how much is this angle this is not 360
degree because it hasn't completely 360
degree yet so what do we call this angle
that we haven't learned yet that what
can we call our angle which is exactly
beginning 180 degree that is great angle
and for complete and then okay we will
learn that in the next plane and finally
the clock strikes 12:00 so the actually
the minute hand that so this our hand
had actually covered one complete
revolution so now it has completed 3
speedily so
this is your right angle this is your
straight angle and this one is your
complete angle so when you observe the
angle formed between the minute hand at
the hour hand of the clock so what do
you see you see the anti-fascist buying
from 3 o clock 6 o clock 9 o clock 12 o
clock the angle also keeps increasing
now here I would like to bring your
notice a very simple thing which might
create confusion in your mind now you
might say that okay in this case we saw
that the angle between the two hands of
the clock was 90 degrees but when you
consider this case here also the angle
between the two hands is 90 degrees but
why are we considering this angle and we
are saying that angle is more than one
is editing this because you only need to
remember from where you started counting
so I will give you an example let's take
let's say that you participated in a DS
you are running and you have to cover
let's see some kilometers by running and
you started from point A so this is your
start point so you start with cop here
and you have to reach a point B so that
this point is your destination now let's
see us running you're running you
reached a point again you can reach the
point so as time and parking water is
happening the distance that you are
covering is ingredient right now let me
read you have reached a point sure now
if I ask you that how much distance have
you covered so what is the distance that
you would calculate so the distance that
you have already covered from wherever
you are started that is some point in
you will measure the distance that you
have covered now instead of that if
somebody starts measuring your position
right now from your destination point
will that give the right
no because your destination point is
where you want to read but for whatever
distance you have already covered you
have to measure the distance from your
stopping point
so the same concept is ticking here so
this was your starting point right so
from the starting point so you started
measuring this angle from this 12
o'clock this with respect to the hand of
the clock
corresponding hundred twelve o'clock so
this was zero Degree for you and this
was 90 degree point now when this kind
of the clock has moved further so you
are and energy field now this very
moment it has moved further you are
still going to measure it with respect
to this hand of the clock distance you
are not supposed to measure it in the
opposite direction so you are going to
measure it with the same reference so
you started measuring from peers and you
always considered this as your baseline
so this was always one arm of the angle
and you always calculated in the
clockwise direction so clockwise
relation is 90 clockwise direction it
will vanish in a clockwise direction in
this case it is 240 degrees and being
clockwise direction in this case it is
360 degree so whenever you are measuring
angle by rotation make sure that you
follow the same reference so that you
know you do not end up doing wrong -
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