Pregunta: Encontrar el volumen del tetaedro con vertices P (0,0,0) Q (1,2,-1) R (3,4,0) y S (-1,-3,4)

Vertices of the tetrahedron are $\mathrm{P}(0,0,0)$, $\mathrm{Q}(1,2,-1)$, $\mathrm{R}(3,4,0)$ and $\mathrm{S}(-1,-3,4)$

The volume of a tetrahedron formed by vectors $\mathrm{a},\mathrm{b},\mathrm{c}$ is $\frac{1}{6}|\mathrm{a}\cdot (\mathrm{b}\times \mathrm{c})|$