Find:- how much steel was actually used, if `1/12` of the steel actually used was wasted in making the tank. Assume `pi = 22/7` , unless stated otherwise.

If the triangle ABC in the Question above is revolved about the side 5 cm, then find the volume of the solid so obtained. Find also the ratio of the volumes of the two solids obtained in above and this Questions. Assume pi = 22/7 , unless stated otherwise.

The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.Assume pi = 22/7 , unless stated otherwise.

A joker’s cap is in the form of a right circular cone of base radius 7 cm and height 24 cm. Find the area of the sheet required to make 10 such caps. Assume pi = 22/7 , unless stated otherwise.

Curved surface area of a cone is 308 cm^2 and its slant height is 14 cm. Find (i) radius of the base and (ii) total surface area of the cone. Assume pi = 22/7 , unless stated otherwise.

Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m. Assume pi = 22/7 , unless stated otherwise.

Find:- the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high. Assume pi = 22/7 , unless stated otherwise.

A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of ₹ 12.50 per m^2 .Assume pi = 22/7 , unless stated otherwise.

The volume of a right circular cone is 9856 cm^3 . If the diameter of the base is 28 cm, find height of the cone. Assume pi = 22/7 , unless stated otherwise.

The volume of a right circular cone is 9856 cm^3 . If the diameter of the base is 28 cm, find slant height of the cone. Assume pi = 22/7 , unless stated otherwise.