Question

Find the curved surface area of a cylinder whose radius is 2r and height is 2h​

Answer 1

curved surface area :2πrh

: 2 ×22/7×2×2

:25.1428571

Answer 2

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

$\green{\therefore{\text{C.S.A\:of\:cylinder=25.12hr\:units}^{2}}}$

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

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 2r\: } \\ \\ : \implies \text{Height(h) = 2h\: } \\ \\ \red{ \underline \bold{To \: Find : }} \\ : \implies \text{C.S.A\: of \: cylinder = ? }$

• According to given question :

$\bold{As \: we \: know \: that} \\ : \implies \text{C.S.A\: of \: cylinder} =2\pi rh \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times \frac{ 22}{7} \times 2r \times 2h\\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times 3.14 \times 4hr \\ \\ \green{ : \implies \text{C.S.A\: of \: cylinder} =25.12hr\: units^{2}} \\ \\ \bold{Some \:formula's\: related \: to\:this\:topic} \\ \pink{\circ\: \text{T.S.A\: of \: cylinder} =2\pi r(h + r)} \\ \\ \pink{\circ\:\text{Volume\: of \: cylinder} = \pi r^{2}h}$