Question 1021646
A right triangle revolved around the long leg will form a cone.
The radius of the cone is the short leg.
The height of the cone is the long leg.
{{{V=(pi/3)R^2h}}}
{{{V=(pi/3)3^2*4}}}
{{{V=12pi}}}
.
.
{{{LSA=pi*R*sqrt(h^2+R^2)}}}
{{{LSA=pi*3*sqrt(4^2+3^2)}}}
{{{LSA=3pi*5}}}
{{{LSA=15pi}}}