In a field bounded by ABCDE, AE = 20 m, AB = 10 m, and DE = 15 m. If AB and DE are perpendicular to AE, and CD is parallel to AE, what is the perimeter of the field?

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?