Question

${\boxed {\LARGE{\mathit {Question:-}}}}$

Write down all formulas related to Hollow sphere and hemisphere ​

Answer 1

$\mapsto\bf{hemisphere}$

Surface Area of Hemisphere = $\sf\color{red}3πr²$

Curved surface area of hemisphere = $\sf\color{red}1/2\: ( 4 π r2)\: = \:2πr2$

Area of base =$\sf\color{red}π r2$

Total Surface Area (TSA) = Curved Surface Area + Area of the Base Circle

$\underline{\bf{= 2 π r2\: + π r2}}$

$\underline{\bf{= \:3 π r2}}$

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$\mapsto\bf{volume\: of \:sphere,}$

$\mapsto\bf{4/3 \:πR3}$

Thus volume of hollow sphere= volume of outer sphere- volume of inner sphere

$\sf\color{skyblue}= 4/3\: πR3-\:4/3\: πr3$

$\sf\color{blue}= 4/3 \:π(R3-r3)$

$\bold\pink{\fbox{\sf{CSA \:of\: hollow\: sphere}}}$

= CSA of outer sphere - CSA of inner sphere

$\sf\color{gold}= 4 \:πR2\: -\: 4 πr2$

$\sf\color{green}= 4 \:π\:(R2-r2)$

Thankyou :?