Question

plz answer it fast......​

Answer 1

Here's your answer is......................

Answer 2

$\large{\underline{\underline{\mathfrak{\green{\sf{QUESTION :-}}}}}}$.

• The area of base of a right circular cylinder 154 cm² and its height is 8 cm , find the curved surface area of the cylinder .

_____________________

$\large{\underline{\underline{\mathfrak{\bf{SOLUTION:-}}}}}$.

_____________________

$\large{\underline{\underline{\mathfrak{\bf{GIVEN\:HERE:-}}}}}$.

• The area of base of a right circular cylinder 154 cm² .

• height of cylinder (h) = 8 cm.

______________________

$\large{\underline{\underline{\mathfrak{\bf{\:FIND\:HERE:-}}}}}$

• the curved surface area of the cylinder .

______________________

$\large{\underline{\underline{\mathfrak{\bf{\:EXPLANATION:-}}}}}$.

WE KNOW,

Area of base of a right circular cylinder

$\bold{\boxed{\boxed{\:Area\:=\:\pi\:r^2}}}$

$\leadsto\:154\:=\:\pi\:r^2$

$\leadsto\:r^2\times\frac{22}{7}\:=\:154$

$\leadsto\:r^2\:=\:\frac{(\cancel{154}\times\:7)}{\cancel{22}}$

$\leadsto\:r^2\:=\:(7\times\:7)$

$\leadsto\:r\:=\sqrt{49}$

$\leadsto\:r\:=\sqrt{(7\times\:7)}$

$\bold{\boxed{\boxed{\:r\:=\:7}}}$..(1)

______________________

Now,

The curved surface area of cylinder

$\bold{\boxed{\boxed{\:CSA\:=\:2\pi\:rh}}}$

$\leadsto\:CSA\:=\:2\times\:\cancel{7}\times\frac{22}{\cancel{7}}\times8$

$\leadsto\:CSA\:=\:2\times\:22\times8$

$\bold{\boxed{\boxed{\:CSA\:=\:352 cm^2}}}$

______________________

$\bold{\underline{\underline{\:Using\:Formula:-}}}$

• $\:Area\:of\:Circle\:=\pi\:r^2$

• $\:CSA\:=\:2\pi\:rh$

• $\pi\:=\frac{22}{7}$

______________________