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Triangle
A triangle is a plane figure with three straight sides and three angles, the simplest polygon. Its angles sum to 180 degrees, and its rigidity underpins surveying and structural engineering.
Triangle (1981 TV series)
Triangle (1981–1983), BBC soap opera set on a North Sea ferry on the Felixstowe–Gothenburg–Amsterdam route, created by Bill Sellars, starring Kate O'Mara; 78 episodes, filmed aboard Tor Scandinavia, remembered as a BBC failure.
Triangle (2009 British film)
Triangle is a 2009 British-Australian psychological horror film directed by Christopher Smith, in which Melissa George and friends board a ship and become trapped in a time loop.
Triangle (铁三角) (2007 film)
Triangle (鐵三角, The Iron Triangle) is a 2007 Hong Kong heist thriller directed in relay by Tsui Hark, Ringo Lam, and Johnnie To, about three friends digging for gold treasure beneath Hong Kong's Legislative Council Building.
Triangle Agency
Triangle Agency is a 2024 tabletop RPG by Caleb Zane Huett and Sean Ireland (Haunted Table Games), a paranormal corporate-horror investigation game using d4 pools, the ARC system, and a Playwall of unlockable content; winner of 2025 Gold ENNIEs for Best Game, Best Rules, and Best Writing.
Triangle Group
Triangle Group, also known as Triangle Tire, is a Chinese tire manufacturer in Weihai, Shandong, making passenger, commercial, and off-the-road tires sold in over 180 countries.
Triangle inequality
The triangle inequality states that any side of a triangle is shorter than the sum of the other two sides, also known as the triangular inequality theorem.
Triangle of Sadness
Triangle of Sadness (2022) is Ruben Östlund's English-language debut satire, also called Sans filtre in French, about models Carl and Yaya on a doomed luxury yacht; it won the 2022 Palme d'Or and three Oscar nominations.
Triangle offense
The Triangle offense (triple-post offense) is Sam Barry and Tex Winter's read-and-react basketball system: sideline triangle plus weak-side two-man game, no set plays. It won 11 NBA titles under Phil Jackson with the Bulls and Lakers before fading in the mid-2010s.
Triangle Peak Partners
Triangle Peak Partners is a venture capital and growth-equity firm founded in 2008 and headquartered in Carmel, California, investing in technology from Series B through pre-IPO.
Triangle Shirtwaist Factory fire
The Triangle Shirtwaist Factory fire (March 25, 1911) killed 146 garment workers, mostly young immigrant women, in New York's Asch Building; locked doors, a collapsed fire escape, and short ladders led to New York factory safety reforms.
Triangle Strategy (トライアングルストラテジー)
Triangle Strategy (トライアングルストラテジー) is a Square Enix HD-2D tactical RPG by Artdink and the Asano team, released on Switch March 4, 2022 and later PC, PS5, Xbox, and Meta Quest, set in Norzelia with the Scales of Conviction voting system.
Triangle Universities Nuclear Laboratory
The Triangle Universities Nuclear Laboratory (TUNL) is a Department of Energy Center of Excellence for nuclear physics, a four-university consortium based at Duke University in Durham, North Carolina.
Triangle wave
A triangle wave is a periodic waveform that rises and falls at constant, equal slopes, forming a continuous symmetric zigzag used as the carrier in PWM circuits.
Triangular decomposition
Triangular decomposition is a symbolic technique for solving polynomial systems by splitting the solution set into simpler components described by triangular sets, one variable at a time.
Triangular distribution
The triangular distribution is a continuous probability distribution on a bounded interval whose density rises linearly to a mode and falls linearly to a maximum value, defined by three parameters.
Triangular flow
Triangular flow is the third Fourier coefficient, v3, of particle emission angles in ultrarelativistic heavy-ion collisions, caused by random fluctuations in the initial collision zone's triangular shape.
Triangular lattice antiferromagnet
A triangular lattice antiferromagnet is a magnet whose spins sit on a triangular two-dimensional lattice with antiferromagnetic exchange, making it the canonical example of geometric frustration since the 1970s.
Triangular matrix
A triangular matrix is a square matrix with all zeros on one side of the main diagonal, upper or lower, whose eigenvalues are its diagonal entries.
Triangular number
A triangular number counts objects arranged in an equilateral triangle, equaling the sum 1 + 2 + ... + n; the first few are 0, 1, 3, 6, and 10.
Triangular numbers
A triangular number is the sum of the integers from 1 to n, equal to n(n+1)/2; the sequence begins 0, 1, 3, 6, 10, 15, 21.
Triangular prism
A triangular prism is a three-dimensional polyhedron with two parallel triangular bases joined by three rectangular side faces, giving 5 faces, 9 edges, and 6 vertices.
Triangular theory of love
Sternberg's triangular theory of love (1986) models love as intimacy, passion, and decision/commitment forming a triangle, yielding eight kinds of love and the Triangular Love Scale, validated cross-culturally.
Triangular trade
Triangular trade: the 16th-19th century Atlantic circuit linking Europe, West Africa, and the Americas, in which manufactured goods were traded for enslaved Africans carried via the Middle Passage, and colonial commodities like sugar returned to Europe.
Triangulated category
A triangulated category is an additive category with a shift and distinguished triangles abstracting mapping cones and long exact sequences, introduced by Verdier in 1967, with Puppe's independent 1962 axioms.
Triangulation
Triangulation in computer vision is the process of computing a point's 3D position by intersecting rays back-projected from two or more cameras with known geometry.
Triangulation (psychology)
Triangulation in psychology, a family-systems concept from Murray Bowen's theory, describes two feuding family members, usually parents, drawing a third person, most often a child, into their conflict.
Triangulation (social science)
Triangulation in social science is the use of more than one method, data source, investigator, or theory to study the same question, boosting confidence in findings.
Triangulene
Triangulene, also called Clar's hydrocarbon, is a triangular molecule of 22 carbon atoms in six fused benzene rings, hypothesized in 1950 and first made in 2017.
Triângulo
Triângulo (Triângulo Mineiro, Zona do Triângulo), western region of Minas Gerais, Brazil, bounded by the Grande and Paranaíba rivers; TMAP mesoregion of 66 municipalities, over 2 million people, main cities Uberaba and Uberlândia, agribusiness hub.