Descriptive Geometry/General method of rotation

To rotate an object: Find a line axis: if rotating a point or a line, the subject cannot be incident with the axis (the point cannot be on the axis) Find the center of rotation: it is the line of axis in point view Find the path of rotation: The plane of rotation is perpendicular to the line axis. When viewing the plane of rotation in true shape, the path of rotation is a circular one. The radius of rotation is the distance between the subject and the center of rotation. Rotation in various views: Viewing the line in point view: construct the circular path directly Viewing the line in oblique views: Find the line in true length and point view, then apply the construction above