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The curved surface area of a sphere of radius r is
A2 pi r squared
B4 pi r squared
C(4/3) pi r cubed
Dpi r squared
Answer & Solution
Correct answer: B. 4 pi r squared
1. Standard formula for sphere surface.
2. SA = 4 × pi × r squared.
3. Hence option A.
_Source: NCERT Class 10 Mathematics, Ch 12 "Surface Areas and Volumes", §12.2_
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