出典:Wiktionary
出典:『Wiktionary』 (2024/11/23 02:19 UTC 版)
equilateral triangle (plural equilateral triangles)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/29 03:34 UTC 版)
In geometry, an equilateral triangle is a triangle in which all three sides are equal. In traditional or Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. They are regular polygons, and can therefore also be referred to as regular triangles.