半径 bànjìng radius
How to remember 半径: 半 half + 径 path = radius.
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How it is used
- 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).