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प्रश्न
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
विकल्प
1 : 7
1 : 5
7 : 1
8 : 1
उत्तर
`r= (1.6m)/2`
`=160/2`
`=80 cm`
`h = 20 cm`
The ratio of lateral surface to the total surface area of cylinder
`s_1/s_2 = (2pirh)/(2pir (h+r))`
`s_1/s_2= h /(h + r)`
` = 20/(20 + 80)`
`s_1 / s_2 = 20/100`
`= 1/5`
`s_1 : s_2 = 1:5`
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