Definition

1. Noun:
   • A three-sided polygon: A closed geometric figure formed by three straight line segments that connect three points not in a straight line.
   • Something approximating the shape of a triangle: Any object, arrangement, or area that has a roughly triangular form.
   • A small northern constellation: A constellation named Triangulum, located near Perseus, Andromeda, and Aries.
   • A percussion instrument: A simple metal instrument, bent into a triangular shape with one open corner, played by striking it with a metal beater.
   • A drafting instrument: Any of various tools, often made of plastic or metal with a triangular shape, used in technical drawing to create lines at specific angles.

Examples of Usage

• Noun:
  • The children learned to identify a triangle by its three sides and three angles.
  • A triangle of sunlight fell on the floor through the window.
  • The constellation Triangle is faint but visible on a clear night.
  • The percussionist gently struck the triangle to add a shimmering sound to the piece.
  • The architect used a triangle to draw parallel lines on the blueprint.

Advanced Usage

• "The eternal triangle": A dramatic situation or plot involving a romantic rivalry between two people over a third; a love triangle.
  • The novel's plot revolves around the classic eternal triangle.
• "The Bermuda Triangle": A loosely defined region in the western part of the North Atlantic Ocean where numerous aircraft and ships are said to have disappeared under mysterious circumstances.
  • Many theories attempt to explain the mysteries of the Bermuda Triangle.

Variants and Related Words

• Triangular (adj): Having the shape of a triangle; involving three people or parties.
  • They sat in a triangular formation.
• Triangulate (verb): To divide into triangles; to measure or establish something using the principles of trigonometry.
  • Surveyors triangulate distances to create accurate maps.

Synonyms

• Trigon (n): A technical term for a triangle, especially in trigonometry.
• Delta (n): A landform at the mouth of a river, often triangular in shape (e.g., the Nile Delta).

Related Phrases

• Love triangle (n phrase): A romantic relationship involving three people.
  • The movie is a complicated story of a love triangle.
• Right triangle (n phrase): A triangle containing one 90-degree (right) angle.
  • The Pythagorean theorem applies to right triangles.
• Isosceles triangle (n phrase): A triangle with two sides of equal length.
• Equilateral triangle (n phrase): A triangle with all three sides of equal length.

Noun

1. a percussion instrument consisting of a metal bar bent in the shape of an open triangle
2. any of various triangular drafting instruments used to draw straight lines at specified angles
3. a small northern constellation near Perseus between Andromeda and Aries
4. something approximating the shape of a triangle
   • the coastline of Chile and Argentina and Brazil forms two legs of a triangle
5. a three-sided polygon