The area of a regular polygon with a side of 8 cm is 112 cm2. If the perpendicular distance from the centre to a side of the polygon (apothem) is 7 cm, then the number of sides of the polygon is:

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?