What is the volume of a sphere of radius 3 cm?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 72π cm3.
Radius ⇒ r = 3√2 cm
Volume of sphere = 4/3 × π × r3
⇒ 4/3 × π × (3√2)3
⇒ 4/3 × π × 27 × 2√2
⇒ 4/3 × π × 54√2
⇒ 216/3 × π × √2
⇒ 72 π √2 cm3