正三角形

Also known as regular triangle, equiangular triangle

各辺の長さと全ての内角がそれぞれ等しい3角形

AI overview

An equilateral triangle is a geometric shape with three sides that are all exactly the same length. It's a fundamental shape in geometry that appears frequently in nature and mathematics, making it useful for understanding basic principles of symmetry and balance.

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

In the Vinony graph

Vinony's link graph records 734 inbound references to 正三角形, and connects out to quadrilateral, parallelogram and trapezoid.

It sits within the topics Constructible polygons and Types of triangles.

Vinony links it to 80 Wikipedia language editions.

Wikidata facts

Subclass of: acute triangle
Image: Regular triangle.svg

Show 6 more facts

different from: isosceles triangle
has characteristic: perimeter
has facet polytope: edge
Commons category: Equilateral triangles
Schläfli symbol: {3}
maintained by WikiProject: WikiProject Mathematics

Sources (5)

via Wikidata · CC0

Article · 日本語

正三角形（せいさんかくけい、英: equilateral triangle）は、正多角形である三角形である。つまり、3本の辺の長さが全て等しい三角形である。3つの内角の大きさが全て等しい三角形と定義してもよい。1つの内角は 60°（π/3 rad）である。また一つの内角が60°である二等辺三角形は正三角形となる。

Abstract from DBpedia / Wikipedia · CC BY-SA