If the length of the circular cylinder made , of metal is 20 cm and its radius is 4 cm. How many, spheres of radius 2 cm can be made by melting this ?

What is the radius of a sphere having volume and surface area are equal numerically. How many small spheres of radius. '1 cm' can be made by melting that metallic spheres?

From a rectangular sheet measuring 84 cm by 24 cm , how many discs of radius 4 cm can be cut out?

A metallic sphere of radius '4 cm' is melted and recast. How many small spheres of radius '1 cm' will get from it?

Calculate the surface area and volume of a sphere of radius '3 cm .'

If the length of an arc of a sector having radius 9 cm is 2 pi cm , then find the central angle of the sector?

The radius and height of wax made cylinder are '6 cm' and '12 cm' respectively. A cone of same base radius and height has been made from this cylinder by cutting out. a) Find the volume of cone. b) How many candles with '1 cm' radius and '12 cm' height can be made using the remaining wax?

The base radius and height of a metal. cylinder are 4 centimetres and 10 centimetres. If it is melted and recast. into spheres of radius 2 centimetres each, how many spheres can be made?

The radius of a cylinder is increasing at the rate of 5 cm/min so that its volume is constant. When its radius is 5 cm and height is 3 cm, then the rate of decreasing of its height is a)6 cm/min b)3 cm/min c)2cm/min d)5 cm/min