Triangle

Geometry

A triangle, also called a trigon, is a plane polygon with three sides, three vertices and three internal angles. Its angles sum to a straight angle, 180 degrees or π radians. A triangle may be classified by its angles and side lengths. In Euclidean geometry, three non-collinear points determine a unique triangle. Relationships between triangle angles and side lengths are a major focus of trigonometry.

Sides: Three
Angle sum: 180 degrees or π radians
Area: One-half the product of its height and base length

Sources and credits

Article: Triangle (English Wikipedia)
Wikidata: Q19821
Text: Card text is adapted from the English Wikipedia article by an automated summary. Wikipedia content is available under CC BY-SA 4.0; see the article history for its contributors. CC BY-SA 4.0 · Article history and contributors
Illustration: By Oleg Alexandrov, Optimised by 17jiangz1. Public domain · File page on Wikimedia Commons
Oleg Alexandrov, Optimised by 17jiangz1, Own work
Modifications: Placed on a plain background, resized and converted to WebP
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