Question

1. The ratio between the curved surface area and the total surface area of a right circular cylinder is 1:2. Find the ratio between the height and the radius of the cylinder.​

Answer 1

Step-by-step explanation:

Curved surface area of cylinder =2πrh

Total surface area =2πrh+2πr2

Given: 2πrh+2πr22πrh=21

→h+rh=21

⇒2h=h+r

⇒h=r

rh=1

∴ required ratio h:r=1:1