Question 979956
Diameter of the cone's circular base is 4, so the radius is 2.


The cone height becomes the longer leg of a 30-60-90 triangle with hypotenuse 4, small leg 2, and that longer leg for the cone height, h.


r=2, to use in volume  {{{h*pi*r^2}}} and {{{2^2+h^2=4^2}}}.


Solve for h;
use it in the volume expression and evaluate volume.