Hi all,

I have this problem which I am stuck on!

Find the volume of the tetrahedron with vertices at

$\displaystyle A(1; 0; 0), B(3; 1; 1), C(-1; 2; 1), D(2; 2; 2). $

The problem also has the note: the volume of the tetrahedron is one sixth of the volume of the

parallelepiped spanned by the vectors $\displaystyle AB. AC, AD $.

Any help is much appreciated,

Dranalion