Question

find the curved surface area of cylinder of radius 21 cm and height 28 cm ?​

Answer 1

Answer:

3696

Step-by-step explanation:

C.S.A of cylinder is 2πrh

2×22/7×21×28

3696

Answer 2

$\huge\underline\mathrm{Question-}$

Find the curved surface area of cylinder of radius 21 cm and height 28 cm.

$\huge\underline\mathrm{Answer-}$

Curved surface area (CSA) of cylinder = 3696 m²

$\huge\underline\mathrm{Solution-}$

We know that,

$\large{\boxed{\rm{\pink{CSA\:of\:cylinder=2\pi\:rh}}}}$

$\begin{lgathered}\bold{Where} \begin{cases}\sf{\blue{r\:refers\:to\:the\:radius\:that\:is\:21cm}} \\ \sf{\green{h\:refers\:to\:the\:height\:that\:is\:28cm}}\end{cases}\end{lgathered}$

★ Putting the given values,

$\mapsto$ Curved surface area of cylinder = 2 × $\dfrac{22}{\cancel{7}}$ × $\cancel{21}$ × 28

$\mapsto$ Curved surface area of cylinder = 3696 m²

Therefore, curved surface area of cylinder is 3696 m².