 If each triangle inequality holds strictly, "h" > 0 and the triangle is non-degenerate (has positive area); but if one of the inequalities holds with equality, so "h" = 0, the triangle is degenerate.In Euclidean space, the hypervolume of an -facet of an -simplex is less than or equal to the sum of the hypervolumes of the other facets.In particular, the area of a triangular face of a tetrahedron is less than or equal to the sum of the areas of the other three sides.