不ふ等とう辺へん四し辺へん形けいふとうへんしへんけいじ字FuriganaMeanings1nountrapezium; trapezoidgeometry›A quadrilateral with no parallel sides. In Japanese geometry, this term specifically refers to a general quadrilateral without any parallel sides, distinguishing it from 台形 (trapezoid with one pair of parallel sides) and 平行四辺形 (parallelogram).不
