Question

Find the volume and curved surface area of cylinder whose height is 20 cm and radius of the base is 2.8 cm

Answer 1

Answer:

csa = 352

volume= 492.8

Step-by-step explanation:

formula of curved surface area of cylinder is 2Πrh

therefore, csa for given radius i.e., 2.8cm and for given height i.e., 20 cm is 2× 22/7 ×2.8 × 20= 352cm²

now formula for volume is Πr²h

therefore, for the given radius and height the volume is 22/7 × (2.8)² × 20 = 492.8cm³

Answer 2

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

$\green{\therefore{\text{Volume\:of\:cylinder=492.8\:cm}^{3}}}$

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

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

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 2.8 \: cm} \\ \\ : \implies \text{Height(h) = 20 \: cm} \\ \\ \red{ \underline \bold{To \: Find : }} \\ : \implies \text{Volume \: of \: cylinder = ? }\\ \\ : \implies \text{C.S.A \: of \: cylinder = ?}$

• According to given question :

$\bold{As \: we \: know \: that } \\ : \implies \text{Volume \: of \: cylinder} = \pi {r}^{2} h \\ \\ : \implies \text{Volume \: of \: cylinder} = \frac{22}{7} \times {2.8}^{2} \times 20\\ \\ : \implies \text{Volume \: of \: cylinder} =22 \times 1.12 \times 20 \\ \\ \green{ : \implies \text{Volume \: of \: cylinder} =492.8 \: {cm}^{3} } \\ \\ \bold{As \: we \: know \: that} \\ : \implies \text{C.S.A\: of \: cylinder} =2\pi rh \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times \frac{ 22}{7} \times 2.8 \times 20 \\ \\ : \implies \text{C.S.A\: of \: cylinder} =2 \times 22 \times 8\\ \\ \green{ : \implies \text{C.S.A\: of \: cylinder} =352 \: {m}^{2}}$