等とう辺へん三さん角かく形けい

noun

equilateral triangle

Geometric term for a triangle with three equal sides. Note: English gloss is 'isosceles triangle', but the Japanese term 等辺三角形 normally means 'equilateral triangle'. The English gloss may be an error; the standard Japanese term for 'isosceles triangle' is 二等辺三角形.

• 等とう辺へん三さん角かく形けいの三みっつの辺へんの長ながさはすべて等ひとしい。

  All three sides of an equilateral triangle are equal in length.