The ratio of lateral surface area to the total surface area of a cylinder with base diameter 1.6 m and height 20 cm is `1\ :7` (b) `1\ :5` (c) `7\ :1` (d) `5\ :1`

Explanation

`r=frac{1.6 m}{2} `


`=frac{160}{2} `


`=80 cm `


`h=20 cm`


Ratio brtween the lateral surface and the total surface area of cylinder


`frac{s_{1}}{s_{2}} =frac{2 pi r h}{2 pi r(h+r)} `


`frac{s_{1}}{s_{2}} =frac{h}{h+r} `


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