Given a tetrahedron $\Delta$ with unspecified vertices $v_1, v_2, v_3, v_4$, but numerically specified edge lengths $h_{12}, h_{23}, h_{31}, h_{14}, h_{24}, h_{34}$, which create the constraints
$h_{12} = |v1 - v2| \\ h_{23} = |v2 - v3| \\ h_{31} = |v3 - v1| \\ h_{14} = |v1 - v4| \\ h_{24} = |v2 - v4| \\ h_{34} = |v3 - v4|$
Now if I change one of the specified $h$ values, let's say $h_{24}$ then how can I calculate the other $h$ values, namely $h_{14}$ and $h_{34}$ in this example?