alleryA cylinder of radius 7 cm has total surface area 1100 cm2. Using pi = 22/7, what is its height?
A18 cm
B25 cm
C15 cm
D11 cm
Answer & Solution
Correct answer: A. 18 cm
1. TSA = 2πr(r + h) gives 44(7 + h) = 1100.
2. 7 + h = 25, so h = 18 cm.
3. 25 cm forgets to subtract the radius.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, Example 7_
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