Consider a tetrahedron with faces \( F_1, F_2, F_3, F_4 \). Let \( \vec{v_1}, \vec{v_2}, \vec{v_3}, \vec{v_4} \) be area vectors perpendicular to these faces in the outward direction, then \( |\vec{v_1} + \vec{v_2} + \vec{v_3} + \vec{v_4}| \) equals
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Consider a tetrahedron with faces $F1, F2, F3, F4$. Let $\vecv1, \vecV2, \vecv3, \vecv4$ be area vectors perpendicular to these faces in outward direction, then $|\vecv1+\vecV2+\vecV3+\vecV4|$ equals