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एक लंब वृत्तीय बेलन त्रिज्या r वाले एक गोले को पूर्णतया घेरे हुए है (देखिए आकृति) ज्ञात । कीजिए :
(i) गोले का पृष्ठीय क्षेत्रफल
(ii) बेलन का वक्र पृष्ठीय क्षेत्रफल (iii) ऊपर (1) और (ii) में प्राप्त क्षेत्रफलौ का अनुपात
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