Question:The ratio of total surface area to lateral surface area of a cylinder whose radius is `20` cm. and height of the wire is : 

A `2 : 1` 
B `3 : 2` 
C `4 : 3` 
D `5 : 3` 

+ Answer
C 

+ Explanation
`(Total surface Area)/(Lateral surface Area)`

`= (2πrh + 2πr^2)/(2πrh)`

`= (h + r)/h`

`= 80/60`

`= 4/3`

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Irin Moni

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