We present the discovery of three transiting planets from the WASP survey, two hot-Jupiters: WASP-177 b (~0.5M_Jup_, ~1.6R_Ju_p) in a 3.07-d orbit of a V=12.6 K2 star, WASP-183 b (~0.5M_Jup_, ~1.5R_Jup_) in a 4.11-d orbit of a V=12.8 G9/K0 star; and one hot-Saturn planet WASP-181 b (~0.3M_Jup_, ~1.2R_Jup_) in a 4.52-d orbit of a V=12.9 G2 star. Each planet is close to the upper bound of mass-radius space and has a scaled semimajor axis, a/R*, between 9.6 and 12.1. These lie in the transition between systems that tend to be in orbits that are well aligned with their host-star's spin and those that show a higher dispersion.