triangel

Also known as 3-gon, 2-simplex

thumb|Triangle, a polygon with three corners (vertices) and three lines (sides) 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 called edges, are one-dimensional line segments. 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 a plane figure and its interior is a planar region. Sometimes an arbitrary edge is

AI overview

A triangle is a basic geometric shape made up of three corners (called vertices) and three straight sides (called edges) that connect them. Triangles are important in geometry and mathematics because their internal angles always add up to 180 degrees, which is a fundamental property that makes them useful for understanding shapes and solving practical problems.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Instance of: geometric shape
Followed by: tetrahedron
Follows: line segment
Image: Triangolo-Scaleno.svg

Show 12 more facts

Unicode character: 🔻
has facet polytope: edge
Commons category: Triangles
topic's main category: Category:Triangles
has characteristic: area of a triangle
different from: isosceles triangle
has vertex figure: line segment
described by source: Encyclopædia Britannica 11th edition
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
maintained by WikiProject: WikiProject Mathematics
Wikimedia outline: list of triangle topics
topic has template: Q25744722

Sources (4)

via Wikidata · CC0

Article · Svenska

Triangeln (trigon) är en tresidig polygon och en av de grundläggande geometriska formerna. En triangel begränsas av tre räta linjer vars skärningpunkter bildar triangelns hörn. Triangelns hörn betecknas vanligen med A, B, C och motsvarande vinklar med . Triangeln kan refereras till som triangeln ABC eller betecknas . Sidan a säges vara motstående sida till hörnet A och vinkeln . Hörnet A sägs vara motstående hörn till sidan a. Semiperimetern är triangelns halva omkrets eller Artikeln behandlar trianglar i planet; trianglar på sfäriska och hyperboliska ytor har särskilda artiklar.

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