Frustum Concepts - Surface Area & Volume, CBSE Class 10 Mathematics Video Lecture

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before watching this video please make
sure that you have watched part 1 to
part 14 let's understand faster first
them is a new person here
so take a cone like this if you cut
without line positive parallel to this
base you get such kind of ear and this
kind of figure is gone
Rustom why do we need trust them you see
in the real life is glass cube or this
this is nothing but a foster you see
this glass a lot of figures in our real
life the bucket do you see the bucket
which we use filling bottle that is also
foster not of vessels in a real life is
in the form of pasta
or sometimes you see the cap that super
beard is also something is washed down
the Mike lab you see so there are so
many figures in a real life that is
involved so we should learn faster
correct but first him how to get the
first time you take a cone this version
to line correct you get now a frustum
just have the form last that you have to
learn ashley to find the volume and see
the in the flustered you can mention
that lee this is our to the bigger it is
at the r1 because they are two surplus
small you see right once after is this
circle which has one radius and one
circle it's the bigger circle and this
also has a so bigger circle by
convention is called harmony the smaller
ice core not the height of the first and
is H and the slant height of the first
turn is this is the typical convention
of the system so you find out why too
hard to find the volume of the cross
term the volume is 1 by 3 by H P new
Harmon square plus part
square plus 1 by 3 PI H into i1 square
with R 2 square plus 1 R 2 if you want
to find the curved surface if you are
the first term that is Phi R 1 R 2 L
right in the chorus PI RL here it's
quite other plus R 2 into L where L is
nothing but you see by mathematical
because we can find this hell yeah this
guy is H and this phase nothing but a
vimana circle right so this is H naught
equal to dou X square is H and this is
minus so minus the volume of the curve
surface area of frustum is pi yard if
you want to find producer basically
first then you have to add this this
curve surface area plus this base area
PI R square and this area this media by
Armstrong here also L is nothing but X
square plus or minus ions just
understand this formula the further
course ability of the cone is also
basically the first time is PI into R 1
plus R 2 L and the volume of the first
row of the cone is 1 by 3 PI H nu R 1
square plus R 2 square plus R 1 notice
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