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  1. Triangle - Wikipedia

    A triangle has three internal angles, each one bounded by a pair of adjacent edges; the sum of angles of a triangle always equals a straight angle (180 degrees or π radians). The triangle is …

  2. Triangles - Equilateral, Isosceles and Scalene

    A triangle has three sides and three angles. The three angles always add to 180°. There are three special names given to triangles that tell how...

  3. Triangle: Definition, Parts, Properties, Types, Formulas

    May 13, 2024 · What is a triangle – find out its definition, parts, properties, different types with their classifications and formulae of area and perimeter using diagrams

  4. Triangle - Math.net

    A triangle is a closed, two-dimensional shape that has 3 sides, 3 angles, and 3 vertices. It is the polygon with the fewest sides. Since it is the simplest form of a polygon, any polygon can be …

  5. TRIANGLE Definition & Meaning - Merriam-Webster

    The meaning of TRIANGLE is a polygon having three sides. How to use triangle in a sentence.

  6. Triangle | Definition & Facts | Britannica

    5 days ago · triangle, in geometry, a three-sided polygon. Triangles are formed by three line segments, sometimes called edges, whose end points intersect at points known as the …

  7. Properties of Triangle - GeeksforGeeks

    Jul 23, 2025 · A triangle is a basic geometric form with three sides and three corners. Each side links to two adjacent sides, resulting in three corners where the sides meet.

  8. Triangles | Geometry (all content) | Math | Khan Academy

    You probably like triangles. You think they are useful. They show up a lot. What you'll see in this topic is that they are far more magical and mystical than you ever imagined!

  9. Triangle definition and properties - Math Open Reference

    It is usual to name each vertex of a triangle with a single capital (upper-case) letter. The sides can be named with a single small (lower case) letter, and named after the opposite angle.

  10. Triangle - Types and properties - AllMath

    Feb 1, 2024 · A triangle is a fundamental geometric shape composed of three-line segments that intersect at three distinct points. This article aims to cover the definition, types, properties, …