1. Definition 2 We define an Adjointly circle of triangle ABC a circle which contains two vertexes of the triangle and in one of these vertexes is tangent to the respective side

2. It is known that carbon atoms can be arranged in two possible ways in the Cementite lattice, namely, at the centers of trigonal prisms with iron atoms at the vertexes and at the centers of slightly deformed octahedrons (octahedral