A circle made of wire with a diameter of 49 cm is unfolded and bent into a rectangle whose sides are in the ratio 7 : 4. Find the area of the rectangle. [Take 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?