Exterior angle

Japanese: 外角 - がいかく

〘noun〙① A point that protrudes outward from an object. A convex angle. [Commentary on the Book of Songs - Taiga, Yi]② In mathematics, the angle between the extension of one side and the adjacent side at each vertex of a polygon. The sum of the exterior angles is equal to four right angles. ⇔ Interior angle. ③ In baseball, the corner of home plate farthest from the batter. The outside corner. ⇔ Interior angle. *Ittosai wore the number 6 (1955)〈Gomi Yasusuke〉4 "The first pitch was hit low and on the outside corner to the lefty batter. A strike."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① 物体の外部に突き出た突端。凸角(とっかく)。〔詩経疏‐大雅・抑〕② 数学で、多角形の各頂点において、一辺の延長とそれに隣り合う一辺とのなす角。外角の総和は四直角に等しい。⇔内角。③ 野球で、本塁ベースの、打者に遠い側のかど。アウトコーナー。⇔内角。※一刀斎は背番号６（1955）〈五味康祐〉四「初球は左打者の外角低目一ぱいをついた。ストライク」

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