A square and a semi-circle with a closed base are formed using pieces of wire of length 144 cm each. The ratio of the area of the square to that of the semi-circle is: (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?