If one small square in a grid has an area of 4 sq. units, what is the perimeter of a rectangle drawn on the grid that is 4 squares long and 2 squares wide?

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?