This paper describes a visual method for checking homogeneous polynomial inequalities of the typef(a,b, c) >0 whena, b, care the side lengths of a triangleABC.The similarity class ofABCcan be represented by a unique point in a planePof trilinear coordinates and such points fill out a certain triangular diskDinP.Then the functionfdetermines a curve in P. To decide whether the required inequality holds it suffices to check that does not enter the interior ofD.