The total surface area of a hemisphere is 4158 m². If the radius of the hemisphere becomes one-third of its original size, what will be the new curved surface area of the hemisphere?
(Use π = 22/7)
Show answer & explanation
Correct answer: A
Explanation
Total surface area of the hemisphere = 3πr² = 4158
πr² = 4158/3 = 1386
New radius = r/3
New curved surface area = 2π(r/3)²
= 2πr²/9
= 2 × 1386 / 9
= 308 m²