A square park has an area of 4356 m2. Taking one round of it is the same as taking one round of another circular park. Find the area of the circular park. (Use π = 22/7)

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?