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三角形

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Also known as 3-gon, 2-simplex

有3條邊的多邊形

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.

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Wikidata facts

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

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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

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Article · 中文

三角形，又稱三邊形（英語： Triangle），是由三条线段顺次首尾相连，或不共線的三點兩兩連接，所组成的一个闭合的平面几何图形，是最基本和最少邊的多边形。一般用大写英语字母、和为三角形的顶点标号；用小写英语字母、和表示边；用、和給角標號，又或者以這樣的顶点标号来表示。

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