► 名詞周囲 [(1)しゅうい]
meaning: circumference rank: 2☆
頭の周囲の
長さ ⇨ The circumference of a head. A head size
(☛ Not interchangeable with 周辺 in this sense)円周 [えんしゅう]
meaning: circumference rank: 4☆ 円周は
直径掛ける
パイで
求まる ⇨ The circumference will be calculated by multiplying the diameter with pi