alleryA hollow cylinder of curved area 4224 cm2 is cut open to a 33 cm wide rectangle. Its perimeter?
A161 cm
B322 cm
C256 cm
D128 cm
Answer & Solution
Correct answer: B. 322 cm
1. The rectangle's area is the curved area, 4224 cm2.
2. Length = 4224 ÷ 33 = 128 cm.
3. Perimeter = 2(128 + 33) = 322 cm.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, Exercise 9.2_
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