# Triangle vs. Quadrilateral — What's the Difference?

## Compare with Definitions

#### Triangle

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry.
May 14, 2022

A quadrilateral is a polygon in Euclidean plane geometry with four edges (sides) and four vertices (corners). Other names for quadrilateral include quadrangle (in analogy to triangle) and tetragon (in analogy to, e.g., pentagon or hexagon).
May 14, 2022

#### Triangle

The plane figure formed by connecting three points not in a straight line by straight line segments; a three-sided polygon.
May 14, 2022

A polygon having four sides.
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#### Triangle

Something shaped like such a figure
A triangle of land.
May 14, 2022

Having four sides.
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#### Triangle

Any of various flat, three-sided drawing and drafting guides, used especially to draw straight lines at specific angles.
May 14, 2022

A polygon with four sides.
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#### Triangle

(Music) A percussion instrument consisting of a piece of metal in the shape of a triangle open at one angle.
May 14, 2022

An area defended by four fortresses supporting each other.
The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.
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#### Triangle

A relationship involving three people, especially a ménage à trois.
May 14, 2022

Having four sides.
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#### Triangle

(geometry) A polygon with three sides and three angles. Category:en:Trigonometry
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Having four sides, and consequently four angles; quadrangular.
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#### Triangle

A set square.
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A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
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#### Triangle

(music) A percussion instrument made by forming a metal rod into a triangular shape which is open at one angle. It is suspended from a string and hit with a metal bar to make a resonant sound.
May 14, 2022

An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.
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#### Triangle

(cue sports) A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
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A four-sided polygon
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#### Triangle

A love triangle.
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Having four sides
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#### Triangle

(systemics) The structure of systems composed with three interrelated objects.
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#### Triangle

A draughtsman's square in the form of a right-angled triangle.
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#### Triangle

A frame formed of three poles stuck in the ground and united at the top, to which people were bound when undergoing corporal punishment.
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#### Triangle

Any of various large papilionid butterflies of the genus Graphium.
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#### Triangle

(rail) A triangular formation of railway tracks, with a curve on at least one side.
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#### Triangle

A figure bounded by three lines, and containing three angles.
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#### Triangle

An instrument of percussion, usually made of a rod of steel, bent into the form of a triangle, open at one angle, and sounded by being struck with a small metallic rod.
May 14, 2022

#### Triangle

A draughtsman's square in the form of a right-angled triangle.
May 14, 2022

#### Triangle

A kind of frame formed of three poles stuck in the ground and united at the top, to which soldiers were bound when undergoing corporal punishment, - now disused.
May 14, 2022

#### Triangle

A small constellation situated between Aries and Andromeda.
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#### Triangle

A three-sided polygon
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#### Triangle

Something approximating the shape of a triangle;
The coastline of Chile and Argentina and Brazil forms two legs of a triangle
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#### Triangle

Any of various triangular drafting instruments used to draw straight lines at specified angles
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#### Triangle

A percussion instrument consisting of a metal bar bent in the shape of an open triangle
May 14, 2022