The ratio of radii of two right circular cylinders is 2:3.and their heights are in the ratio 5:4 .find the ratio of their curved surface areas. दो लंब वृत्तीय बेलन की त्रिज्या का अनुपात 2:3 है और उनकी ऊंचाई का अनुपात 5:4 है | उनके वक्र पृष्ठ का अनुपात ज्ञात कीजिए |

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