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Consider a tetrahedron with faces F(1),F...

Consider a tetrahedron with faces `F_(1),F_(2),F_(3),F_(4)`. Let `vec(V_(1)), vecV_(2),vecV_(3),vecV_(4)` be the vectors whose magnitude are respectively equal to areas of `F_(1).F_(2).F_(3).F_(4)` and whose directions are perpendicular to their faces in outward direction. Then `|vecV_(1) + vecV_(2) + vecV_(3) + vecV_(4)|`, equals:

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