A cone has a base radius of 8 cm and a vertical height of 15 cm. What is its total surface area (in cm2, rounded off to the nearest integer)? (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?