Q. 295.0( 1 Vote )

Prove that the se

Answer :

Let r ,h,l and θ be the radius ,height, slant height and semi-vertical angle of the cone respectively.

We know that ,volume of cone

Let S be the curved Surface area of cone.

Now ,

At ,

Hence, for , surface area is minimum.


cotθ = √2

θ = cot-1(√2)

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