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You need to make some assumptions and just put up formulas
assume that the lateral height of the cone=l= \sqrt{r^2 +h^2}
and assume that the base radius of the cone is r
so you have, V= \pi r^2h/3
then you have C.S.A. OF A CONE =  \pi rl
and a good hint is that you should use the formula of l as given above in the formula of the csa of the cone.
i hope this helps you:)
feel free to ask any querries:)
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