A thin wire is in the form of a square of area 1296 cm2. The wire is cut and reshaped into 7 semicircles of the same radius. What is the radius of each semicircle? (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?