Question
The ratio of total surface area to lateral surface area of a cylinder whose radius is 20 cm and length 60 cm is :
Answer: Option C
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`(Total surface area )/(Lateral surface area) `
= `(2 pi r h + 2 pi r^2)/(2 pi r h)`
=` (h + r)/(h) = (60 + 20)/60 = 80/60 = 4/3` = 4 : 3
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