The radii of two right circular cylinders are in the ratio 4:3 and their heights are in the ratio 7:4 then the ratio of their curved surface areas is in the ratio
3: 5
5: 3
3 : 7
7 : 3
Explanation:
Curved surface area = $2\pi rh$
Curved surface area = $2\pi rh$
$2\pi r_{1}h_{1}:2\pi r_{2}h_{2}$
$4\times7:3\times4$
$7:3$