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.
円周角の定理を使って、角度を求めなさい。
Find the angle using the inscribed angle theorem.
同じ弧に対する円周角は等しい。
Inscribed angles subtending the same arc are equal.