A conical tent is to be made with a canvas having a base radius of 7 units and a height of 4 units. How much canvas (in square units) will be required to make the tent? (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?