Question

The ratio of total surface area to lateral surface area of a cylinder whose radius is 20 cm and height 60 cm, is:

• A. 2:1
• B. 3:2
• C. 4:3
• D. 5:3

Answer 1

The correct option is C 4:3

Given, radius of the cylinder = 20 cm
Height of the cylinder = 60 cm

We know that, $\frac{TotalSurfaceArea}{LateralSurfaceArea}=\frac{2\pi rh+2\pi r^2}{2\pi rh}$
$=\frac{2\pi r(h+r)}{2\pi rh}$
$=\frac{h+r}{h}$
$=\frac{60+20}{60}$
$=\frac{4}{3}$