Question

The radius of a cylinder is 21 cm, height is 25 cm . Find its lateral surface area .

Answer 1

Answer:

3300cm²

Step-by-step explanation:

CSA ( cylinder) =

$2\pi \: r \: h$

= 2 × 22/7 × 21 × 25

= 2× 22 × 3 × 25

= 3300 cm²

Answer 2

$\bigstar{\pmb{\underline{\sf{Required\: Solution:-}}}}$

• Radius of Cylinder = 21 cm
• Height = 25 cm
• Lateral Surface Area = ?

°${\underline\pink{\boxed {\sf LSA = 2 \pi rh}}}$

$\implies \sf LSA = 2 \times \dfrac{22}{ \cancel7} \times \cancel{21} \times 25$

$\implies \sf LSA = 2 \times 22 \times 25$

$\implies \sf LSA = 1100 \: {cm}^{3}$

And we are done :D

ADDITIONAL INFORMATION:-

${\pmb{\underline{\sf{ TSA \: of \: cylinder= 2 \pi r(r + h)}}}}$

${\pmb{\underline{\sf{volume\: of \:cylinder =πr²h}}}}$