維基辭典粵語詞反饋粵拼:bun3 ging3原書拼音: /puːn³³ kɪŋ³³/01radius (line segment between any point on the circumference of a circle or sphere and its center) (Classifier: 條／条 m)02radius (length of that line segment)用例以半徑為弦，五步自乘得二十五。