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लोहे की एक सीट में 2 मीटर व्यास तथा 40 मीटर लम्बाई का एक लम्ब वृत्तीय बेलन बनाना है इसके लिए आवश्यक लोहे की सीट का आयतन = (`" मी"^(2 )` में )

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लोहे की एक सीट में 2 मीटर व्यास तथा 40 मीटर लम्बाई का एक लम्ब वृत्तीय बेलन बनाना है इसके लिए आवश्यक लोहे की सीट का आयतन = (`" मी"^(2 )` में )
A. `40pi`
B. `60pi`
C. `80pi`
D. इनमें से कोई नहीं
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Correct Answer - A
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