allery7 cm त्रिज्या और 5 cm ऊँचाई वाले एक ड्रम का वक्र पृष्ठीय क्षेत्रफल कितना होगा? (π = 22/7)
A154 sq cm
B440 sq cm
C110 sq cm
D220 sq cm
Answer & Solution
Correct answer: D. 220 sq cm
वक्र पृष्ठीय क्षेत्रफल = 2πrh = 2 × (22/7) × 7 × 5 = 220 sq cm.
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