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  2. The radii of two right circular cylinders are in the ratio 2:3 and ther heights are in the ratio 5:4. Calculate the ratio of their curved surface areas
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The radii of two right circular cylinders are in the ratio 2:3 and ther heights are in the ratio 5:4. Calculate the ratio of their curved surface areas

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S safeer

The required ratio is 

\\\frac{\pi r_1^2h}{\pi r_2^2h}=(\frac{r_1}{r_2})^2\times(\frac{h_1}{h_2})\\\\=(\frac{2}{3})^2\times(\frac{5}{4})=\frac{5}{9}

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