Mensurationhard · Past Paper
If the surface area of a sphere is 4πr², and it is cut into four equal parts through the center, find the total surface area of all four parts.
A8πr²
B6πr²
C4πr²
D12πr²
✓ Correct Answer: A — 8πr²
Original area = 4πr². Each part has original curved area/4 = πr² and two semi-circular faces = πr². Total per part = 2πr². Total for 4 parts = 8πr².
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