球きゅう面めん三さん角かく法ほうきゅうめんさんかくほうじ字FuriganaMeanings1nounspherical trigonometrymathematics›A branch of mathematics dealing with triangles on the surface of a sphere, used in astronomy, geodesy, and navigation.球きゅう面めん三さん角かく法ほうは、天てん文もん学がくや測
