  W. Thurston suggested a method for computing hyperbolic volume of hyperbolic
3-manifolds, based on a triangulation of the manifold. The method was
implemented by J. Weeks in the program SnapPea, which produces a decimal
approximation as a result. For hyperbolic 2-bridge links, we give formulae that
allow one to find the exact volume, i.e. to construct a polynomial and to find
volume as an analytic function of one of its roots. The computation is
performed directly from a reduced, alternating link diagram.
