Question 880847
The volume of a sphere is,
{{{V[s]=(4/3)pi*R[s]^3}}}
So the volume of a hemisphere is half that,
{{{V[hs]=(2/3)pi*R[s]^3}}}
The volume of the cylinder is,
{{{V[c]=pi*R[c]^2*L}}}
If you know the volume of the cylinder then,
{{{V[c]=(2/3)pi*R[s]^3}}}
{{{R[hs]^3=(3V[c])/(2pi)}}}
{{{R[hs]=((3V[c])/(2pi))^(1/3)}}}