345Dreieck

345Dreieck is a term that appears in German-language technical and cultural contexts to denote a triadic geometric motif rooted in the 3-4-5 Pythagorean triple. The name combines the digits 3, 4 and 5 with the German word Dreieck (triangle). In its geometric sense, a 345Dreieck is a right triangle with legs of lengths 3 and 4 units and a hypotenuse of length 5 units, illustrating the Pythagorean theorem.

In education, the 3-4-5 triangle is a simple, integral right triangle example, and the label 345Dreieck is sometimes used in German-language teaching materials to emphasize the triple. The construction can be demonstrated by drawing a horizontal segment of length 3, erecting a perpendicular of length 4 from one endpoint, and connecting endpoints to form a right angle.

In design and architecture contexts, the term has been used to describe triangular configurations or tiling patterns that emphasize a 3-4-5 proportion, such as assemblies of triangles that form a larger modular unit. In contemporary art and branding, 345Dreieck can appear as a motif or corporate or project name recognizing its geometric clarity and symbolic balance.

See also: 3-4-5 triangle; Pythagorean triple.