Question

if the diameter of the hemisphere is 28cm then,the find the total surface area of hemisphere​

Answer 1

Given :

• Diameter of Hemisphere = 28cm

To Find :

• Total Surface Area of Hemisphere.

Solution :

$\longmapsto\tt{Diameter=28cm}$

$\longmapsto\tt{Radius=\cancel\dfrac{28}{2}=14cm}$

Using Formula :

$\longmapsto\tt\boxed{T.S.A\:of\:Hemisphere=3\pi{{r}^{2}}}$

Putting Values :

$\longmapsto\tt{3\times\dfrac{22}{\cancel{7}}\times{\cancel{14}}\times{14}}$

$\longmapsto\tt{3\times{22}\times{2}\times{14}}$

$\longmapsto\tt\bold{1848{cm}^{2}}$

So , The T.S.A of Hemisphere is 1848cm²..

_______________________

• C.S.A of Hemisphere = 2πr²
• T.S.A of Hemisphere = 3πr²
• Volume of Hemisphere = 2/3πr³

_______________________

Answer 2

$\large{\red{\underline{\underline{\bold{Given}}}}}$

• Diametre of hemisphere is =28 cm

$\large{\blue{\underline{\underline{\bold{To find}}}}}$

• The total surface of the hemisphere of the diameter of hemisphere is 28 cm

$\large{\green{\underline{\underline{\bold{Solution}}}}}$

$\rightarrow$$\textsf{Diametre =28 cm ,d=2r}$

$\rightarrow$$\textsf{Radius= Diameter/2= 28 cm/2 = 14 cm}$

$so \: the \: total \: surface \: area \: of \: hemisphere \: = 3\pi {r}^{2} \\ here \: r \: is \: radius \:$

3×22/7×14×14

TSA of hemisphere is 1848cm²