Triangular microliths may be isosceles, scalene or equilateral. A regular tetrahedron is one in which all four faces are equilateral triangles. Three of the five Platonic solids are composed of equilateral triangles. Equilateral triangles are found in many other geometric constructs. Three nearby points form an equilateral triangle. Hexahexaflexagons can be constructed from different shaped nets of eighteen equilateral triangles. It is the only radially equilateral convex polyhedron. Its shape is that of a hexagram, the compound of two equilateral triangles. Truss members are made up of all equivalent equilateral triangles. It has five equilateral triangular faces meeting at each vertex. Truss members form a series of equilateral triangles, alternating up and down. This causes an equilateral triangle to have three interior angles of 60 degrees. For example, one can consider a geometric shape such as an equilateral triangle. It graphically depicts the ratios of the three variables as positions in an equilateral triangle. The structure has three internal concrete cores in the form of an equilateral triangle.