public Tetrahedron (double hight, double edge, double area, double summ){ // первый конструктор
        this.hight = hight;
        this.setName("Прав.Тетраэдр.");
        this.edge = edge;
        this.area_surf = area;
        this.summ = summ;
        this.area = 1.732*edge*edge;
        this.volume = edge*edge*edge*0.707;
    }