Given that the curved surface area of a hemisphere is 2772, determine the radius of the hemisphere
Show answer & explanation
Correct answer: A
Explanation
Curved surface area = 2772 cm²
According to the formula: Curved surface area = 2πr²
2πr² = 2772
⇒ 2 × (22/7) × r² = 2772
⇒ (44/7)r² = 2772
⇒ r² = (2772 × 7) / 44 = 63 × 7 = 441
⇒ r = 21 cm