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The centre of the constellation lies halfway between Gamma Andromedae and Alpha Arietis.The official constellation boundaries, as set by Eugène Delporte in 1930, are defined as a polygon of 14 segments.Delta is a spectroscopic binary system composed of two yellow main sequence stars of similar dimensions to the Sun that lies 35 light-years from Earth.
The Ancient Greeks called Triangulum Deltoton (Δελτωτόν), as the constellation resembled an upper-case Greek letter delta (Δ).
The white stars Beta and Gamma Trianguli, of apparent magnitudes 3.00 and 4.00, respectively, form the base of the triangle and the yellow-white Alpha Trianguli, of magnitude 3.41, the apex.
Iota Trianguli is a notable double star system, and there are three star systems with known planets located in Triangulum.
Polish astronomer Johannes Hevelius excised three faint stars—6, 10 and 12 Trianguli—to form the new constellation of Triangulum Minus in his 1690 Firmamentum Sobiescianum, renaming the original as Triangulum Majus.
A small constellation, Triangulum is bordered by Andromeda to the north and west, Pisces to the west and south, Aries to the south, and Perseus to the east.