周しゅう長ちょう

noun

perimeter; circumference

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。

  Please calculate the perimeter of this rectangle.

• 円えんの周しゅう長ちょうは直ちょっ径けいに円えん周しゅう率りつをかけて求もとめます。

  The circumference of a circle is found by multiplying the diameter by pi.