If the numerical value of the volume of a sphere is equal to the numerical value of its surface area, find the radius of the sphere.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 3 units.
Volume of sphere = (4/3)πr3
Surface area of sphere = 4πr2
(4/3)πr3 = 4πr2
⇒ (1/3)r = 1
⇒ r = 3