The radius and height of a right circular cone are in the ratio 4 : 3. and its volume is 2156 cm3. Find the curved surface area of the cone.
Since the radius and height of a cone is 4:3 so let radius = 4x and height = 3x
Volume of a cone 
, Given volume =
⇒ 
⇒ x 
So , r =14 cm and height = 10.5 cm
Here, r=14 cm and h=10.5 cm
Curved surface area of a cone = 
20