Amanani a-Irrational asoloko esenzeka kwi-geometry. Umzekelo, ukuba sine-square esinecala eliyimitha enye ngobude, umgama okwiikona engaphesheya kwenye okanye ekwelinye icala, kwi-square-root sezi kona zimbini, ezilingana no-1.414213 ... . Le ke linani eli-irrational. I-Mathematika iye yabonakalisa okokuba i-square root salo naliphi na inani eli-natural lisenokuba yi-integer okanye sibe linani eli-irrational.