alleryWhat is the formula for the curved surface area of a cylinder of radius r and height h?
Aπr2h
B2πrh
C2πr + h
Dπrh
Answer & Solution
Correct answer: B. 2πrh
1. The curved surface opens into a rectangle with length 2πr and width h.
2. Its area is 2πr × h = 2πrh.
3. 2πr(r + h) adds the two circular ends, and πr2h is the volume.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, 9.4.3 Cylinders_
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