Question

5. The volume of sphere is 4851 cm3. Then its
surface area is
(A) 1186 cm?
(B) 1386 cm
2
(C) 1486 cm
2
(D) 1286 cm
2​

Answer 1

Answer:

Step-by-step

Let, radius of the sphere be r units.

Volume of the sphere = (4 / 3) * (22 / 7) * (r^3) cubic units = (88 / 21) * (r^3) cubic units.

(88 / 21) * (r^3) = 4851

(r^3) = (441) * (21 / 8) = (21^3) / (2^3)

r = (21 / 2).

Area of the curved surface of the sphere = 4 * (22 / 7) * (r^2) sq units = (88 / 7) * (21 / 2) * (21 / 2) sq units = (22 * 3 * 21) sq units = 1386 sq units.ep explanation: