File:Triangle_illustration.svg · Wikimedia Commons · See Wikimedia Commons
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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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- Triangolo-Scaleno.svg
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Article · 日本語
三角形（さんかくけい、さんかっけい、拉: triangulum, 独: Dreieck, 英, 仏: triangle, (古風) trigon）は、同一直線上にない3点と、それらを結ぶ3つの線分からなる多角形。その3点を三角形の頂点、3つの線分を三角形の辺という。
Abstract from DBpedia / Wikipedia · CC BY-SA