Question

9. The curved surface area of a cylinder of height 5 cm and base circumference 100
cm is *

20 sq.cm
50 sg.cm
500 so.cm
300 sq. cm​

Answer 1

Given :-

• height, h = 5 cm
• base circumference = 100 cm

To Find :-

• curved surface of the cylinder ?

Solution :-

we know that,

$\boxed{ \bold{circumference = 2\pi r}}$

$\bold{: \implies 2\pi r = 100 \: cm}$

and , we know that too,

$\boxed{ \bold{C.S.A \: of \: cylinder = 2\pi rh}}$

$\bold{: \implies2\pi rh \times 5 \: cm }$

now, put the value of 2πr = 100 cm

$\bold{ : \implies 100 cm \times 5 cm} \\ \\ \bold{: \implies 500 \: {cm}^{2} } \: \: \: \: \: \: \: \: \: \: \:$

so, curved surface area of the cylinder is 500 cm²

hence, option (c) is correct