Trigonometriya

Su'wrettegi u'shmu'yeshler : sinus A = a/c; cosinus A = b/c; tangens A = a/b.

Trigonometriya, Qadimgi Grek tilinde trigōnon "u'shmu'yeshlik" + metron "o'lshew" so'zlerinen kelip shiqqan ilim.