円えん周しゅう角かく

noun

inscribed angle; angle at the circumference

Geometry term: an angle whose vertex lies on a circle and whose sides are chords of the circle. Commonly taught in Japanese junior high school mathematics.

• 円えん周しゅう角かくの定てい理りを使つかって、角かく度どを求もとめなさい。

  Find the angle using the inscribed angle theorem.

• 同おなじ弧こに対たいする円えん周しゅう角かくは等ひとしい。

  Inscribed angles subtending the same arc are equal.