Question

A right cylinder has a radius of 3 and a height of 12. What is its surface area? O A. 72 units O B. 90 units O c. 45rt units O D. 108r units​

Answer 1

Answer:

$A=72\pi\ units^2$

Step-by-step explanation:

Given that,

The radius of the cylinder, r = 3

Height of the cylinder, h = 12

We need to find the surface area of the cylinder. The formula for the surface area of a cylindrical object is given by :

$A=2\pi rh\\\\=2\times \pi\times 3\times 12\\\\=72\pi\ units^2$

So, the surface area of the cylinder is equal to $72\pi\ units^2$.