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If the curved surface area of a solid cy...

If the curved surface area of a solid cylinder is one-third of its total surface area, then what is the ratio of its diameter to its height ?
यदि किसी ठोस बेलन का वक्र पृष्ठ क्षेत्रफल इसके कुल पृष्ठ क्षेत्रफल का एक-तिहाई है, तो इसके व्यास और इसकी ऊंचाई में अनुपात ज्ञात करें |

A

`5:2`

B

`1:1`

C

`2:1`

D

`4:1`

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