also: とうかくさんかっけい
noun
equiangular triangle; equilateral triangle; regular triangle
Geometric term for a triangle with all angles equal (and thus all sides equal). Essentially synonymous with 正三角形, though 等角三角形 emphasizes angle equality.
See also: 正三角形
等角三角形は、すべての内角が60度である。
An equiangular triangle has all interior angles equal to 60 degrees.
この図形は等角三角形なので、三辺の長さも等しい。
Since this shape is an equiangular triangle, its three sides are also equal in length.
正三角形 is the more common term for an equilateral triangle. 等角三角形 is less frequent and emphasizes the angle property.
Compound of 等角 (equal angles) and 三角形 (triangle). A straightforward technical term.