Question

find the curved surface area and total surface area of a cylinder whose radius is 7cum nd height 9 cm​

Answer 1

Step-by-step explanation:

hope it will help you..

Answer 2

$\blue{\bold{\underline{\underline{Answer:}}}}$

$\green{\therefore{\text{C.S.A\:of\:cylinder=396\:cm}^{2}}}$

$\green{\therefore{\text{T.S.A\:of\:cylinder=704\:cm}^{2}}}$

$\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}$

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 7\: cm} \\ \\ : \implies \text{Height(h) = 9 \: cm} \\ \\ \red{ \underline \bold{To \: Find : }} \\ : \implies \text{C.S.A \: of \: cylinder = ? }\\ \\ : \implies \text{T.S.A\: of \: cylinder = ? }$

• According to given question :

$\bold{As \: we \: know \: that } \\ : \implies \text{C.S.A\: of \: cylinder} =2\pi rh \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times \frac{ 22}{7} \times 7\times 9 \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times 22 \times 9\\ \\ \green{ : \implies \text{C.S.A\: of \: cylinder} =396 \: {cm}^{2}} \\ \\ \bold{As \: we \: know \: that} \\ : \implies \text{T.S.A\: of \: cylinder} =2\pi r(h + r) \\ \\ : \implies \text{T.S.A\: of \: cylinder} =2 \times \frac{22}{7} \times 7(9+ 7) \\ \\ : \implies \text{T.S.A\: of \: cylinder} =2 \times 22 \times 16 \\ \\ \green{ : \implies \text{T.S.A\: of \: cylinder} =704\: {cm}^{2} }$