A cylinder with radius `r\ ` and height `h` is closed on the top and bottom. Which of the following expressions represents the total surface area of this cylinder? (a) `2pir\ (r+h)` (b) `pir\ (r+2h)` (c) `pir\ (2r+h)` (d) `2pir^2+h`

Explanation

in cylinder which is closed,

radius `=r`

height `=h`

so curved surface area`=2pirh`

and area of base and upper surface `= 2xxpir^2`
so total area `=2pirh+ 2xxpir^2`

`=2pir(r+h)`
so ans is (a)