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NCERT Solutions Class 9 Mathematics Solutions for Surface Areas and Volumes - Exercise 13.4 in Chapter 13 - Surface Areas and Volumes
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Find the total surface area of a hemisphere of radius 10 cm. [Use π=3.14]
Answer:
Radius of hemisphere, r = 10 cm
Formula: Total surface area of hemisphere = 3 \pi r^{2}
\begin{aligned} &=3 \times 3.14 \times 10^{2}=942\\ &\text { The total surface area of given hemisphere is } 942 \mathrm{cm}^{2} \end{aligned}
Video transcript
"hello students welcome to lido q a video
session i am saf your math tutor
and question for today is find the total
surface area of the hemisphere
of radius 10 centimeter use pi is equal
to 3.14
so radius of the hemisphere let us say r
that is equal to 10 centimeter
formula now to find the total surface of
the hemisphere is three pi r square
so 3 into
y value has to be taken as 3.14
into 10 square
this will give us 942.
942 is the total surface area
that is 942 centimeter
square hence
our total surface area of the hemisphere
is 940
centimeters square if you have any query
regarding this you can drop it in our
comment section
and subscribe to lido for more such q a
thank you for watching
"
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