An analytical expression is given for the mean-squared radius of gyration, [R(g)2], of a broken rodlike chain model having random distributions with respect to both the lengths of constituent rods and random coils. The expressions of [R(g)2] and also of the scattering function are employed in the analysis of the observed [R(g)2] and the scattering curve for isotactic polystyrene gel to obtain the conformation of a single chain in the gel state. It is shown that both observed data are in more satisfactory agreement with the present equations than with the previous equations in which the length distribution of the constituents are not taken into account.