Two solid right cones of equal height an...

Two solid right cones of equal height and of radii `r_1` and `r_2` are melted and madeto form a solid sphere of radius R. Then the height of the cone is_____

`(4R^2)/(r_1^2 + r_2^2)`

`(4R)/(r_1 + r_2)`

`(4R^3)/(r_1^2 + r_2^2)`

`(R^2)/(r_1^2 + r_2^2)`

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