¶ Triangle
Index Entry
The three angles of one ‘face’ of a planar triangle always add up to 180° as a phenomenon independent of the relative dimensional size of the triangles. One-half of the definitive cycle unity is 180°. Every triangle has two faces-- its obverse and reverse. Unity is two. So we note that the angles of both faces of a triangle add up to 360°. Externally, the sum of the angles around each of the triangle’s three vertexes is 120°, of which 60° is on the obverse side of each vertex; for a triangle, like a line, if it exists, is an isolatable system always having positive and negative aspects. So the sum of the vertexes around a triangle (three) times 360° equals 1080°. The remainder of 360° from 1080° leaves 720°, or one tetrahedron. Q.E.D.
¶ Citations
