Interior angle

Japanese: 内角 - ないかく

〘noun〙① Of the angles formed by two adjacent sides of a polygon, the angle that is inside the polygon. ⇔outside angle. [Five Country Comparison Military Language Dictionary (1881)]② In baseball, the side of home plate that is closer to the batter than the center. Inside corner. ⇔outside corner. ※Baseball (Attack) (1927) <Tobita Suishū> 1 "The course of the ball should ideally be an inside pitch, or it is fine to choose one that is closer to the body than an inside pitch ."

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

Japanese:

〘名〙① 多角形の隣り合う二辺のなす角のうち、多角形の内部にある角。⇔外角。〔五国対照兵語字書（1881）〕② 野球で、ホームプレート上の中央より打者に近い方の側。インコーナー。⇔外角。※ベースボール（攻撃篇）（1927）〈飛田穂洲〉一「タマのコースは内角球を理想とする或は内角(ナイカク)より更らに身体に近いものを選んでもよろしい」

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