直径 zhíjìng diameter
How to remember 直径: 直 straight + 径 path = diameter.
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How it is used
- The geometry term for diameter - 这个圆的直径是十厘米 (zhège yuán de zhíjìng shì shí límǐ) this circle's diameter is ten centimeters.
- Pairs with 半径 (bànjìng, radius); a plain technical noun with no register nuance.