- 周り — surroundings / nearby area
- 円周 — circumference
- 周囲 — perimeter / surroundings
- 周辺 — nearby / vicinity
- 周知 — well-known / widely known
- 周到 — meticulous / thorough
周 connects to the idea of going around a boundary or edge, hence its use in words for perimeters and surroundings. It also names the Zhou dynasty (周) in Chinese history.
この周りには 公園がたくさんあります。
There are many parks around this area.
周囲の人々に 感謝しています。
I’m grateful to the people around me.
円周は 直径 × π です。
The circumference is diameter × pi.