allery7 cm त्रिज्या आणि 5 cm उंची असलेल्या एका ड्रमचे वक्रपृष्ठफळ किती आहे? (pi = 22/7)
A154 sq cm
B440 sq cm
C110 sq cm
D220 sq cm
Answer & Solution
Correct answer: D. 220 sq cm
वक्रपृष्ठफळ 2 pi r h = 2 x 22/7 x 7 x 5 = 220 square centimetres आहे.
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