The perimeter of a right-angled triangle is 72 cm and one of its sides (other than the hypotenuse) is of length 18 cm. Then, the area of the triangle 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?