2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107456We consider the wave equation with a damping term on a partially rectangular planar domain, assuming that the damping is concentrated close to the non-rectangular part of the domain. Polynomial decay estimates for the energy of the solution are established.Analysis of PDEsOptimization and Control35L05; 47A10; 47B44; 47D06; 49J20text