half-diameter編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看half-diameterhalf-diameter — 名詞名詞1. The distance from the center to the edge of a circle; radius.1.名詞釋義半徑The distance from the center to the edge of a circle; radius.例句The half-diameter of the circle is 5 cm.