ルーローの三さん角かく形けいMeanings1nounReuleaux trianglegeometryA shape of constant width formed by the intersection of three circles, used in engineering and geometry.ルーローの三さん角かく形けいは、定てい幅ふく図ず形けいの一ひとつです。The Reuleaux triangle is one of the shapes of constant width.
