The ratio of diameter to height of a Borosil cylindrical glass is 3 : 5. If the actual diameter of the glass is 6 cm, then the curved surface area of the glass is ______.

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The ratio of diameter to height of a Borosil cylindrical glass is 3 : 5. If the actual diameter of the glass is 6 cm, then the curved surface area of the glass is 60$\pi$. Explanation: Given diameter = 6 cm $\to$ radius r = 3 cm. Ratio diameter : height = 3 : 5 $\Rightarrow$ If diameter = 6 (i.e. 3 $\times$ 2) then height = 5 $\times$ 2 = 10 cm. Curved surface area (CSA) of a cylinder = 2$\pi$rh = 2$\pi$ $\times$ 3 $\times$ 10 = 60$\pi$ cm2

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