Question

Two right circular solid cylinders have radii in the ratio $3:5$ and heights in the ratio $2:3$. Find the ratio between their curved surface areas.

• A. $2:5$
• B. $1:5$
• C. $3:5$
• D. $5:2$

Answer 1

The correct option is A $2:5$

Given,

$r_1:r_2=3:5$ and $h_1:h_2=2:3$

We know, the curved surface area of cylinder $=2\pi rh$

Ratio of curved surface area of cylinder,
$=2\pi r_1{h}_2:2\pi r_2{h}_2$

$=\frac{3\times 2}{5\times 3}$

$=2:5$