If the volume of a sphere is 4851 cm3, then its surface area (in cm²) is ?
(Take π = 22/7)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 ie 1386.
(4/3) π r³ = 4851
r³ = (4851 × 3 × 7) / (22 × 4)
r³ = (21² × 21)/2×4
r = 21/2
4π r² = 4 × (22/7) × (21/2)²
= 1386