# NCERT Solutions Class 9 Mathematics Solutions for Surface Areas and Volumes - Exercise 13.4 in Chapter 13 - Surface Areas and Volumes

Question 3 Surface Areas and Volumes - Exercise 13.4

Find the total surface area of a hemisphere of radius 10 cm. [Use π=3.14]

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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