alleryWhich formula gives the total surface area of a closed cylinder?
A2πrh
Bπr2h
C2πr(r + h)
Dπr(r + h)
Answer & Solution
Correct answer: C. 2πr(r + h)
1. Curved part = 2πrh and two circular ends = 2πr2.
2. Adding gives 2πrh + 2πr2 = 2πr(r + h).
3. 2πrh alone leaves out both ends.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, 9.4.3 Cylinders_
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