Question

find the curved surface area of cylinder whose height is equal to radius​

Answer 1

Step-by-step explanation:

CSA of cylinder =2πrh

If the height is equal to radius.

Then 2πr*r

$2πr<sup>2<sup>$

Answer 2

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

$\green{\therefore{\text{C.S.A\:of\:cylinder=}6.28r^{2}\:cm^{2}}}$

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

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

• According to given question :

$\bold{As \: we \: know \: that} \\ : \implies \text{C.S.A\: of \: cylinder} =2\pi rh \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times \frac{ 22}{7} \times r \times r\\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times 3.14 \times r^{2} \\ \\ \green{ : \implies \text{C.S.A\: of \: cylinder} =}6.28r^{2} \: {cm}^{2}\\ \\ \bold{Some \:formula's\: related \: to\:this\:topic} \\ \pink{\circ\: \text{T.S.A\: of \: cylinder} =2\pi r(h + r)} \\ \\ \pink{\circ\:\text{Volume\: of \: cylinder} = \pi r^{2}h}$