A conical tent with radius 6 units and height 8 units is to be made of canvas. How much canvas is needed to make the tent? (Rounded off to two decimal places)

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?