…(1)For each point P on a plane, if P' is the point obtained by rotating P around a fixed point O on the plane by a fixed angle θ, the correspondence of projecting P onto P' is called a rotation on the plane, with O being the center of rotation and θ being the rotation angle. For each point P in space, if P' is the point obtained by rotating P around a fixed line l by a fixed angle θ, the correspondence of projecting P onto P' is called a rotation in space, with l being the rotation axis and θ being the rotation angle. For a point O in space, a rotation around any line that passes through O is called a rotation with O as its center. … *Some of the terminology that mentions "rot" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…(1)平面上の各点Pに対し,Pをその平面上の一定点Oのまわりに一定角θだけまわした点をP′とするとき,PをP′にうつす対応を平面上の回転といい,Oを回転の中心,θを回転角という。空間の各点Pに対し,Pを一定直線lのまわりに一定角θだけまわした点をP′とするとき,PをP′にうつす対応を空間における回転といい,lを回転軸,θを回転角という。空間の1点Oに対し,Oを通る任意の直線を軸とする回転をOを中心とする回転という。… ※「rot」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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