- 直径 — diameter
- 半径 — radius
- 径路 — route / path
- 山径 — mountain path
- 小径 — narrow path / lane
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径 combines 彳 (“step, walk”) with 圭 as phonetic. It originally referred to a footpath and later extended to mathematics as diameter.
この径路は 安全です。
This route is safe.
円の直径を 測りましょう。
Let’s measure the diameter of the circle.