2019 · Q67
The volume of a hemisphere is 155232 cm³. What is the radius of the hemisphere?
Elementary MathematicsMensuration
- A40 cm
- B42 cm
- C38 cm
- D36 cm
Explanation
The hemisphere volume formula gives (2/3)πr³ = 155232, so r³ = 155232 × 3/(2π) = 155232 × 21/44 = 74088. Since 42³ = 74088, r = 42 cm. The answer is (B).