- 円周角{えんしゅうかく}
- angle of circumference: 円周角{えんしゅうかく}
- circumference: circumference n. 円周, 周囲.【動詞+】The tree has a circumference of three meters.この木は(幹の)円周が 3 メートルあるmeasure the circumference of a baby's head赤ん坊の頭蓋周を計る.【形容詞 名詞+】The earth's circumference is about 25,000
- abdominal circumference: 腹囲◆【略】AC