汉字、词语、拼音或英文

半径 bànjìng radius

怎么记住“半径”: 半 half + 径 path = radius.

HSK 8 级
词语

汉字

用法

Radius (geometry) - 圆的半径 (yuán de bànjìng) the radius of a circle.
Also figurative reach: 活动半径 the radius of one's activities/range.
Technical; contrast 直径 (zhíjìng, diameter).