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triangle
 triangletop: right trianglebottom: equilateral triangletri·an·gle T0344300 (trī′ăng′gəl)n.1. a. The plane figure formed by connecting three points not in a straight line by straight line segments; a three-sided polygon.b. Something shaped like such a figure: a triangle of land.2. Any of various flat, three-sided drawing and drafting guides, used especially to draw straight lines at specific angles.3. Music A percussion instrument consisting of a piece of metal in the shape of a triangle open at one angle.4. A relationship involving three people, especially a ménage à trois.
[Middle English, from Old French, from Latin triangulum, from neuter of triangulus, three-angled : tri-, tri- + angulus, angle.]triangle (ˈtraɪˌæŋɡəl) n1. (Mathematics) geometry a three-sided polygon that can be classified by angle, as in an acute triangle, or by side, as in an equilateral triangle. Sum of interior angles: 180°; area: base × height2. any object shaped like a triangle3. any situation involving three parties or points of view. See also eternal triangle4. (Instruments) music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick5. a group of three[C14: from Latin triangulum (noun), from triangulus (adjective), from tri- + angulus corner] ˈtriˌangled adjtri•an•gle art at tribrach (ˈtraɪˌæŋ gəl)
n. 1. a closed plane figure having three sides and three angles. 2. a flat triangular piece with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc. 3. any three-cornered or three-sided figure, object, or piece: a triangle of land. 4. a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod. 5. a group of three; triad. 6. a situation involving three persons, esp. one in which two of them are in love with the third. [1350–1400; Middle English < Latin triangulum, n. use of neuter of triangulus three-cornered. See tri-, angle1] tri′an`gled, adj. ![]() triangleThe area (A) of a triangle can be calculated using the following formula: A = 1/2 bh.tri·an·gle (trī′ăng′gəl) A closed geometric figure consisting of three sides.Triangle a set of three.Example: long wavering triangle of waterfowl, 1895.Thesaurus| Noun | 1. |  triangle - a three-sided polygon trigon, trilateralpolygon, polygonal shape - a closed plane figure bounded by straight sidesacute triangle, acute-angled triangle - a triangle whose interior angles are all acuteequiangular triangle, equilateral triangle - a three-sided regular polygonisosceles triangle - a triangle with two equal sidesoblique triangle - a triangle that contains no right angleobtuse triangle, obtuse-angled triangle - a triangle that contains an obtuse interior angleright triangle, right-angled triangle - a triangle with one right anglescalene triangle - a triangle with no two sides of equal lengthcuneus, wedge, wedge shape - any shape that is triangular in cross section | | 2. |  triangle - something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle"shape, form - the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape" | | 3. |  Triangle - a small northern constellation near Perseus between Andromeda and AriesTriangulum | | 4. |  triangle - any of various triangular drafting instruments used to draw straight lines at specified anglesdrafting instrument - an instrument used by a draftsman in making drawings | | 5. | triangle - a percussion instrument consisting of a metal bar bent in the shape of an open trianglepercussion instrument, percussive instrument - a musical instrument in which the sound is produced by one object striking another |
Translationstriangle (ˈtraiӕŋgl) noun1. a two-dimensional figure with three sides and three angles. 三角(形) 三角（形） 2. a musical instrument consisting of a triangular metal bar that is struck with a small hammer. 三角鐵(一種打擊樂器) 三角铁（一种打击乐器） triˈangular (-gju-) adjective in the shape of a triangle. a triangular road-sign; It is triangular in shape. 三角形的 三角形的triangle → 三角zhCN, 三角铁zhCNtriangle
black triangle1. An unidentified flying object (popularly known as a UFO) in the shape of a dark triangle, typically with points of light in each corner. I know you think I'm crazy, but every spring, I see those black triangles appearing over my corn fields at night!2. In Nazi Germany, a badge assigned to concentration camp inmates considered "asocial" or mentally unfit for work. Her clinical depression, which was vilified by the Nazis, meant she had to wear a black triangle in the concentration camp.See also: black, triangleeternal triangleA sexual encounter or relationship between three people. Although exciting at first, the eternal triangle caused their relationship to suffer and ultimately end.See also: eternal, triangle(the) eternal trianglea sexual or emotional relationship involving two women and one man or two men and one woman. (*Typically, a couple [man and woman] and another man or woman.) Henry can't choose between his wife and his mistress. It's the eternal triangle. I'm surprised Jane doesn't get tired of the eternal triangle. She goes out with Peter at the weekend and Jim during the week.See also: eternal, triangleeternal triangleA relationship involving three lovers, such as two women involved with one man or two men with one woman. For example, The plot of the murder mystery revolved around the eternal triangle of a husband, wife, and another woman . [c. 1900] See also: eternal, triangleeternal triangle a relationship between three people, typically a couple and the lover of one of them, involving sexual rivalry.See also: eternal, triangleeternal triangle, theA threesome of lovers, either two men involved with or vying for one woman or two women and one man. “Eternal” here simply means that this situation has occurred over and over through the ages. The term has been traced to a book review appearing in the London Daily Chronicle in 1907, describing a novel that “deals with the eternal triangle, which, in this case, consists of two men and one woman.”See also: eternaltriangle
triangle, in mathematics, plane figure bounded by three straight lines, the sides, which intersect at three points called the vertices. Any one of the sides may be considered the base of the triangle. The perpendicular distance from a base to the opposite vertex is called an altitude. The area of a triangle is equal to one half the product of the base and the corresponding altitude. The line segment joining the midpoint of a side to the opposite vertex is called a median. All three altitudes of a triangle go through a single point, and all three medians go through a single (usually different) point. In Euclidean geometry the sum of the angles of a triangle is equal to two right angles (180°). If all three angles of a triangle are equal, the triangle is called equilateral. An isosceles triangle has two equal angles. A scalene triangle is one in which all three angles are different. A right triangle has one right angle. In geometry it is shown that two triangles are congruent (i.e., are the same shape and size) if, in general, any three independent parts (sides or angles) of one are the same as the corresponding three parts of the other. The rules of congruency make it possible, in trigonometry, to compute the sides and the angles of a triangle when three of these values are known. The triangle is the simplest of the polygons (i.e., it has the least possible number of sides). Since any polygon can be broken up into triangles by drawing various diagonals, a complete theory of the measurement of triangles provides a complete theory of the measurement of all polygons. In non-Euclidean geometries, the angles of a triangle are either less than two right angles (hyperbolic geometry) or more than two right angles (elliptic geometry).
triangle, in music, percussion instrument consisting of a steel rod bent into a triangle, open at one angle, and struck with a steel rod. Only since the end of the 18th cent. has it been an orchestral instrument, although it appeared in Europe much earlier. Its tinkling sound is of indefinite pitch and therefore blends with whatever harmonies the orchestra produces.TriangleA plane geometrical figure with three sides and three angles; the equilateral triangle has both equal sides and equal angles.  Triangle (religion, spiritualism, and occult)Equivalent to the number three, the triangle concerns the Trinity. The Trinity of ancient Egypt included Isis, Osiris, and Horus; the Hindu Trinity, or Trimurti, includes Brahma, Vishnu, and Shiva; the Greek Trinity included Artemis, Selene, and Hecate. It is the symbol for the Triple Goddess: Maiden-Mother-Crone. In its normal position, with the point at the top, the triangle is a symbol for fire; when inverted—with the point at the bottom—it is a symbol for water. Inverted and with the tip cut off, it is a symbol for earth; upright and with the tip cut off, it symbolizes air. Wiccan traditions that work with a degree system use the inverted triangle as a symbol for the First Degree. Apex upward, it is placed above a pentagram as the sign of the Third Degree. The Greek letter D, or delta, is a triangle and is described as "the letter of the vulva" and as the "Holy Door." Barbara Walker points out that the Jewish tradition of triangular hamantaschen for Purim is an apparent adoption from the ancient Egyptian custom of making triangular cakes for public rituals. Walking under a ladder is considered unlucky because a ladder leaning against a wall forms a triangle. The action breaks that triangle, thus breaking the sacred three and the Trinity. In numerology the number three, the number of the triangle, is ruled by Jupiter and is attuned to the investigator, the scientist, and the seeker; it is also associated with the letters C, L, and U. Triangle a part of the plane bounded by three line segments each pair of which has a common end point. The line segments are called the sides of the triangle, and the end points are called the vertices of the triangle. In English the term “triangle” is also applied to the figure formed by the three line segments.  Figure 1
An equilateral triangle is a triangle with all three sides equal (Figure 1,a). In an isosceles triangle only two of the sides are equal (Figure 1,b). A triangle whose interior angles are all acute is called an acute triangle (Figure 1,c). If one of the angles is a right angle, the triangle is said to be a right triangle (Figure 1,d). If one of the angles is obtuse, the triangle is called an obtuse triangle (Figure 1,e). A triangle cannot have more than one right angle or one obtuse angle, since the sum of all three angles is equal to the sum of two right angles, which is 180° or, in radians, π. The area of a triangle is ah/2, where a is the length of one of its sides, which is designated as the base, and h is the corresponding altitude of the triangle (Figure 1,f). The length of each side of a triangle is smaller than the sum of the lengths of the other two sides and is greater than the difference between the lengths of the other two sides. Each of the following is a necessary and sufficient condition for two triangles to be congruent: (1) each side of one triangle is equal to the corresponding side of the other triangle; (2) two sides and the angle between them of one triangle are equal, respectively, to the corresponding sides and angle of the other triangle; and (3) two angles and the side between their vertices of one triangle are equal, respectively, to the corresponding angles and side of the other triangle. The numerical relations between the angles and sides of triangles are studied in trigonometry. Triangles on a sphere are discussed in SPHERICAL GEOMETRY and SPHERICAL TRIGONOMETRY.
Triangle in mechanical drawing, an instrument for drawing angles. Triangles may be made of wood, plastic, or, less frequently, of metal. The most common triangles have angles of 30°, 60°, and 90° or 45°, 45°, and 90°. Sometimes one side of a triangle is graduated in, for example, millimeters and centimeters so that it can be used as a measuring scale.
Triangle a percussion instrument consisting of a steel bar bent in a triangular form but open at one angle. The triangle is suspended from a strap or string; when struck with a small metal rod, it produces a clear, ringing sound. The triangle is used in or chestras and other instrumental ensembles. triangle[′trī‚aŋ·gəl] (mathematics) The figure realized by connecting three noncollinear points by line segments.
Triangle[′trī‚aŋ·gəl] (astronomy) Triangulum triangle1. Geometry a three-sided polygon that can be classified by angle, as in an acute triangle, or by side, as in an equilateral triangle. Sum of interior angles: 180°; area: ½ base × height 2. Music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick triangleA three-sided polygon. In 3D graphics, the surfaces of 3D objects are broken down into triangles. Small numbers of triangles are used for flat surfaces, while large numbers are used to mold curved surfaces similar to the way a geodesic dome is constructed. The three points of every triangle (vertices) are computed on an X-Y-Z scale and must be recomputed each time the object is moved. See triangle setup and geometry calculations.
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| The smaller the triangle, the more realistic the curve. It takes an enormous number of triangles to simulate totally round objects. (Image courtesy of Intergraph Computer Systems.) |
triangle
triangle [tri´ang-g'l] a three-cornered object, figure, or area, such as a delineated area on the surface of the body; called also trigone.carotid triangle, inferior that between the median line of the neck in front, the sternocleidomastoid muscle, and the anterior belly of the omohyoid muscle.carotid triangle, superior carotid trigone.cephalic triangle one on the anteroposterior plane of the skull, between lines from the occiput to the forehead and to the chin, and from the chin to the forehead.digastric triangle submandibular triangle.Einthoven's triangle an imaginary equilateral triangle with the heart at its center, formed by the axes of the three bipolar limb leads. Einthoven's triangle. Bipolar limb leads I, II, and III form Einthoven's triangle. Other standard positions for electrocardiographic leads are the augmented unipolar leads: aVR (right arm), aVL (left arm), and aVF (left leg). From Polaski and Tatro, 1996.triangle of elbow a triangular area on the front of the elbow, bounded by the brachioradial muscle on the outside and the round pronator muscle inside, with the base toward the humerus.triangle of election superior carotid triangle.facial triangle a triangular area whose points are the basion and the alveolar and nasal points.femoral triangle the area formed superiorly by the inguinal ligament, laterally by the sartorius muscle, and medially by the adductor longus muscle; called also Scarpa's triangle.infraclavicular triangle that formed by the clavicle above, the upper border of the greater pectoral muscle on the inside, and the anterior border of the deltoid muscle on the outside.inguinal triangle the triangular area bounded by the inner edge of the sartorius muscle, the inguinal ligament, and the outer edge of the long adductor muscle.lumbocostoabdominal triangle that lying between the external oblique muscle of the abdomen, the posterior inferior serratus muscle, the erector muscle of the spine, and the internal oblique muscle of the abdomen.occipital triangle the area bounded by the sternocleidomastoid muscle in front, the trapezius muscle behind, and the omohyoid muscle below.Scarpa's triangle femoral triangle.subclavian triangle a triangular area bounded by the clavicle, the sternocleidomastoid muscle, and the omohyoid muscle.suboccipital triangle that lying between the posterior greater rectus muscle of the head and the superior and inferior oblique muscles of the head.tri·an·gle (trī'ang-gĕl), [TA] In anatomy and surgery, a three-sided area with arbitrary or natural boundaries.
See also: trigonum, region. [L. triangulum, fr. tri-, three, + angulus, angle] tri·an·gle (trī'ang-gĕl) [TA] anatomy, surgery A three-sided area with arbitrary or natural boundaries.
See also: trigonum, region[L. triangulum, fr. tri-, three, + angulus, angle]tri·an·gle (trī'ang-gĕl) [TA] In anatomy and surgery, three-sided area with arbitrary or natural boundaries. [L. triangulum, fr. tri-, three, + angulus, angle]triangle
TriangleIn technical analysis, a series of high and low prices for a security that, when plotted on a chart, looks vaguely like a triangle. A triangle indicates that investors do not know whether a bull market or a bear market will prevail. If the triangle breaks upward, it is a bullish sign, but if it breaks downward, it is a bearish sign. A triangle is also called a wedge. See also: Ascending sign, Descending sign.triangle  triangle In technical analysis, a chart pattern indicating the convergence in the movement of successive high and low prices and characterized by a formation that resembles a triangle turned on its side. A triangle indicates a period of combat between bulls and bears with the technical analyst having to determine the winner. If prices break out of the triangle on the upside, it is a bullish sign. A breakout on the downside indicates the bears are winners. The closer the breakout occurs to the point of the triangle, the less conclusive the signal to buy or sell. Also called coil, flag, pennant, wedge. See also ascending triangle, descending triangle.triangle
Synonyms for trianglenoun a three-sided polygonSynonymsRelated Words- polygon
- polygonal shape
- acute triangle
- acute-angled triangle
- equiangular triangle
- equilateral triangle
- isosceles triangle
- oblique triangle
- obtuse triangle
- obtuse-angled triangle
- right triangle
- right-angled triangle
- scalene triangle
- cuneus
- wedge
- wedge shape
noun something approximating the shape of a triangleRelated Wordsnoun a small northern constellation near Perseus between Andromeda and AriesSynonymsnoun any of various triangular drafting instruments used to draw straight lines at specified anglesRelated Wordsnoun a percussion instrument consisting of a metal bar bent in the shape of an open triangleRelated Words- percussion instrument
- percussive instrument
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