Question

If the radius of a cylinder is 5m and height of cylinder is 21m,then find the curved surface area of the cylinder. ​

Answer 1

Given :

• Radius of Cylinder is 5 m.
• Height of Cylinder is 21 m.

To Find :

• Curved Surface Area of Cylinder.

Solution :

$\longmapsto\tt{Radius=5m}$

$\longmapsto\tt{Height=21m}$

Using Formula :

$\longmapsto\tt\boxed{C.S.A\:of\:Cylinder=2\pi{rh}}$

Putting Values :

$\longmapsto\tt{2\times\dfrac{22}{{\cancel{7}}}\times{5}\times{{\cancel{21}}}}$

$\longmapsto\tt{2\times{22}\times{5}\times{3}}$

$\longmapsto\tt\bf{660{m}^{2}}$

So , The C.S.A of Cylinder is 660 cm².

_______________________

• C.S.A of Cylinder = 2πrh
• T.S.A of Cylinder = 2πr(r+h)
• Volume of Cylinder = πr²h

_______________________

Answer 2

Given :

• If the radius of a cylinder is 5m and height of cylinder is 21m

To find :

• curved surface area of the cylinder.

Solution :

curved surface area of the cylinder = 2πrh ...... (formula)

==> 2 x 22/7 x 5 x 21

==> 2 x 22 x 5 x 3

==> 44 x 15

==> 660 m²

∴ curved surface area of the cylinder is 660 m²

Extra information :

• Volume of cylinder = πr²h

• T.S.A of cylinder = 2πrh + 2πr²

• Volume of cone = ⅓ πr²h

• C.S.A of cone = πrl

• T.S.A of cone = πrl + πr²

• Volume of cuboid = l × b × h

• C.S.A of cuboid = 2(l + b)h

• T.S.A of cuboid = 2(lb + bh + lh)