Question

The total surface area of a cylinder of radius 'r' and height 'h' is _____.

• A. $2\pi rh$
• B. $2\pi r(h+r)$
• C. $2\pi rh+\pi r^2$
• D. $2\pi r^2$

Answer 1

The correct option is B $2\pi r(h+r)$

A cylinder has two circular faces, one at the top and other at the bottom, in addition to its curved region.
Therefore, total surface area
= Curved surface area + sum of areas of 2 circular faces
$=2\pi rh+2\pi r^2$
$=2\pi r(h+r)$