Question

The radius of the base of a cylinder is 20 cm and the height is 12 cm. Find the surface area of the cylinder. (Assume $\pi =3.14$).

• A. $4019.2{cm}^3$
• B. $4019.2cm$
• C. $4019.2{cm}^2$
• D. $4018.6{cm}^2$

Answer 1

The correct option is C $4019.2{cm}^2$

Surface area of cylinder is $A=2\pi r(r+h)$

Here, radius is $r=20$ cm and the height is $h=12$ cm.

Thus,

$A=2\pi r(r+h)=2\times 3.14\times 20(20+12)=125.6\times 32=4019.2$

Hence, the surface area of the cylinder is $4019.2$ cm${}^2$.