周しゅう長ちょうしゅうちょうじ字FuriganaMeanings1nounperimeter; circumferencemathematics›Mathematical term for the length of the boundary of a closed shape. 周長 is the general term for perimeter; for circles, 円周 is more common.この長ちょう方ほう形けいの周しゅう長ちょうを計けい算さんしてください。