Color triangle Color triangle A colour triangle is an arrangement of colours within a triangle, based on the additive combination of three primary colors at its corners. An additive colour space defined by three primary colors has a chromaticity gamut that is a color triangle, when the amounts of the primaries are constrained to be nonnegative. Before the theory of additive color was proposed by Thomas Young and further developed by James Clerk Maxwell and Hermann von Helmholtz, triangles were also used to organize colors, for example around a system of red, yellow, and blue primary colors. After the development of the
Reuleaux triangle triangle with the Fina name from 1950 until Petrofina's merger with Total S.A. in 2000. Another corporate logo framed in the Reuleaux triangle, the south-pointing compass of Bavaria Brewery, was part of a makeover by design company Total Identity that won the SAN 2010 Advertiser of the Year award. The Reuleaux triangle is also used in the logo of Colorado School of Mines. In the United States, the National Trails System and United States Bicycle Route System both mark routes with Reuleaux triangles on signage. According to Plateau's laws, the circular arcs in two-dimensional soap bubble clusters meet at 120°