(A) Given: Length of the pipe $(h)$ $= 77 \,cm$.Outer diameter $(D)$ $= 4.4 \,cm$.Outer radius $(R)$ $= \frac{D}{2} = \frac{4.4}{2} = 2.2 \,cm$.The ou

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(A) Given: Length of the pipe $(h)$ $= 77 \,cm$.Outer diameter $(D)$ $= 4.4 \,cm$.Outer radius $(R)$ $= \frac{D}{2} = \frac{4.4}{2} = 2.2 \,cm$.The outer curved surface area of a cylinder is given by the formula $2 \pi R h$.Outer curved surface area $= 2 \times \frac{22}{7} \times 2.2 \times 77 \,cm^{2}$.$= 2 \times 22 \times 2.2 \times 11 \,cm^{2}$.$= 44 \times 24.2 \,cm^{2}$.$= 1064.8 \,cm^{2}$.

Class 9 Mathematics Surface Areas and Volumes Surface Area of a Right Circular Cone

Medium

$A$ metal pipe is $77 \,cm$ long. The inner diameter of a cross section is $4 \,cm$ and the outer diameter is $4.4 \,cm$. Find its outer curved surface area. (in $,cm^{2}$)

A
$1064.8$
B
$1504.8$
C
$1456.8$
D
$6264.9$

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Surface Areas and Volumes

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Surface Area of a Right Circular Cone

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$A$ metal pipe is $77 \,cm$ long. The inner diameter of a cross section is $4 \,cm$ and the outer diameter is $4.4 \,cm$. Find its outer curved surface area. (in $,cm^{2}$)

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The height of a cone is $16 \, cm$ and its base radius is $12 \, cm$. Find the curved surface area and the total surface area of the cone (Use $\pi = 3.14$). (in $, cm^2$)

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