$$\text { Find an equation for the surface obtained by rotating the parabola } y = 3 x ^ { 2 } \text { about the } y \text {-axis. }$$

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The Answer of $$\text { Find an equation for the surface obtained by rotating the parabola } y = 3 x ^ { 2 } \text { about the } y \text {-axis. }$$

$\text { Find an equation for the surface obtained by rotating the parabola } y = 3 x ^ { 2 } \text { about the } y \text {-axis. }$