The total surface area of a hemisphere is 4,158 m2. If the radius of the hemisphere becomes one-third of its original value, then what will be the new curved surface area of the hemisphere? (Use 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?