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  1. Triangle - Wikipedia

    A triangle is a polygon with three corners and three sides, one of the basic shapes in geometry. The corners, also called vertices, are zero- dimensional points while the sides connecting them, also …

  2. Triangles in Geometry - Definition, Shape, Types, Properties

    A triangle is a three-sided polygon that has 3 angles, and 3 vertices. Learn the definition of triangles, their types, parts, properties using a variety of examples.

  3. Triangles - Definition, Properties, Formula | Triangle Shape

    Triangle A triangle is a closed shape with 3 angles, 3 sides, and 3 vertices. A triangle with three vertices P, Q, and R is represented as PQR. The most commonly seen examples of triangles are the …

  4. TRIANGLE Definition & Meaning - Merriam-Webster

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

  5. Triangles - Equilateral, Isosceles and Scalene

    There are three special names given to triangles that tell how...

  6. Triangles in Geometry - GeeksforGeeks

    Jul 23, 2025 · A triangle is a polygon with three sides (edges), three vertices (corners), and three angles. It is the simplest polygon in geometry, and the sum of its interior angles is always 180°. A triangle is …

  7. Triangle | Definition & Facts | Britannica

    Dec 5, 2025 · A triangle is a three-sided polygon, formed by three line segments, whose end points intersect at points known as the vertices.