A copper wire is bent in the form of an equilateral triangle. The area of this triangle is 4356√3 cm2. If the same wire is rebent into a semi-circular shape, then its area (in cm2) 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?