Question

find the curved surface area and total surface area of right circular cylinder whose base has radius 7 cm and height 8cm​

Answer 1

Answer:

CSA of cylinder=2πrh

=2×(22/7)×7×8

=2×22×8

=352 cm²

Answer 2

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

$\green{\therefore{\text{C.S.A\:of\:cylinder=352\:cm}^{2}}}$

$\green{\therefore{\text{T.S.A\:of\:cylinder=660\:cm}^{2}}}$

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

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 7 \: cm} \\ \\ : \implies \text{Height(h) = 8 \: cm} \\ \\ \red{ \underline \bold{To \: Find : }} \\ : \implies \text{C.S.A \: of \: cylinder = ? }\\ \\ : \implies \text{T.S.A\: of \: cylinder = ? }$

• According to given question :

$\bold{As \: we \: know \: that} \\ : \implies \text{C.S.A\: of \: cylinder} =2\pi rh \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times \frac{ 22}{7} \times 7 \times 8 \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times 22 \times 8 \\ \\ \green{ : \implies \text{C.S.A\: of \: cylinder} =352 \: {cm}^{2}} \\ \\ \bold{As \: we \: know \: that} \\ : \implies \text{T.S.A\: of \: cylinder} =2\pi r(h + r) \\ \\ : \implies \text{T.S.A\: of \: cylinder} =2 \times \frac{22}{7} \times 7(8 + 7) \\ \\ : \implies \text{T.S.A\: of \: cylinder} =2 \times 22 \times 15 \\ \\ \green{ : \implies \text{T.S.A\: of \: cylinder} =660 \: {cm}^{2} }$