How many metres of cloth will be required to make a conical tent, the radius of whose base is 21 metres and height is 28 metres, if the width of the cloth is 5 metres? (Take π = 227)

Find the approximate volume and surface area of a sphere of radius 6 cm. (Use π = 227)

Ram has two spherical balls of radius 10.5 cm each and Meena has six spherical balls of radius 7 cm each. What is the total volume of the balls that Meena has?