四边形 sìbiānxíng quadrilateral Definitions Defs Origin Strokes Stroke Words Sentences Sents 不规则四边形 bùguīzésìbiānxíng irregular quadrilateral irregular quadrilateral; trapezium平行四边形 píngxíngsìbiānxíng parallelogram a four-sided shape where the opposite sides are parallel and equal in length
