Question

find the total surface area of a right circula cylinder whose radius is equak to 7cm and height is equal to 21m

Answer 1

Solution: Total Surface Area = Curved surface area + 2 area of base

→ T.S.A = 2πrh + 2πr² = 2πr(h + r)

• Radius = 7 cm
• Height = 21 m or 2100 cm

→ T.S.A = 2 × 22/7 × 7 × (7 + 2100) cm²

→ T.S.A = 44(2107) cm²

→ T.S.A = 92708 cm² or 9.2708 m²

Answer is 9.2708 m²

Answer 2

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

$\green{\therefore{\text{T.S.A\:of\:cylinder=9.2623\:m}^{2}}}$

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

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 0.07\: m} \\ \\ : \implies \text{Height(h) = 21 \: m} \\ \\ \red{ \underline \bold{To \: Find : }} \\ \\ : \implies \text{T.S.A\: of \: cylinder = ? }$

• According to given question :

$\bold{as \: we \: know \: that} \\ : \implies \text{T.S.A\: of \: cylinder} =2\pi r(h + r) \\ \\ : \implies \text{T.S.A\: of \: cylinder} =2 \times \frac{22}{7} \times 0.07(21+ 0.07) \\ \\ : \implies \text{T.S.A\: of \: cylinder} =2 \times 3.14 \times 1.4749 \\ \\ \green{ : \implies \text{T.S.A\: of \: cylinder} =9.2623\: {m}^{2} }\\\\ \text{Some\:formula\:related\:to\:this\:topic}\\ \pink{\circ\:\text{Volume\:of\:cylinder=}\pi r^{2}h}\\\\ \pink{\circ\:\text{C.S.A\:of\:cylinder}=2\pi rh}$