Question

the height of a cylinder is 18cm and radius is 7cm find curve surface area of the cylinder​

Answer 1

Answer:

1099.56cm²

Step-by-step explanation:

the height of a cylinder is 18cm and radius is 7cm find curve surface area of the cylinder

1099.56cm²

Answer 2

$\large\sf\underline{Given\::}$

• Height of the cylinder = 18 cm

• Radius of the cylinder = 7 cm

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$\large\sf\underline{To\:find\::}$

• Curve surface area of the cylinder = ?

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$\large\sf\underline{Formula\:to\:be\:used\::}$

$\sf\:Curve\:surface\:area\:of\:the\:cylinder\:(CSA)\:=\:2 π rh$

where :

• π = $\tt\blue{\frac{22}{7}}$

• r = $\tt\blue{radius}$‎

• h = $\tt\blue{height}$

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$\large\sf\underline{Solution\::}$

$\sf\:Curve\:surface\:area\:of\:the\:cylinder\:=\:2 π rh$

Let's substitute the given values in the formula :

$\sf\implies\:CSA\:=\:2 \times \frac{22}{7} \times 7 \times 18$

$\sf\implies\:CSA\:=\:2 \times \frac{22}{7} \times 126$

$\sf\implies\:CSA\:=\:\frac{44}{7} \times 126$

$\sf\implies\:CSA\:=\:\frac{5544}{7}$

$\sf\implies\:CSA\:=\:\cancel{\frac{5544}{7}}$

$\small{\underline{\boxed{\mathrm\red{\implies\:CSA\:=\:792\:cm^{2}}}}}$ ★

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$\large\sf\underline{Some\:more\:formula\:related\:to\:cylinder\::}$

• Volume of the cylinder = $\sf\:πr^{2}h$

• Surface area of the cylinder = $\sf\:2πrh+2πr^{2}$

• Curved surface area of the cylinder = $\sf\:2πrh$

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!! Hope it helps !!