The features of rotation about a fixed axis Every point of body moves in a circle whose center lies on rotation axis and radius different ◆ Each rotation plane is perpendicular to rotation axis 2 Every point moves through ·d the same angle during a B particular time interval(各点 的△6,,相同)Z   A B A’ B’ The Features of Rotation about a Fixed Axis: Every point of body moves in a circle whose center lies on rotation axis and radius different. Each rotation plane is perpendicular to rotation axis. Every point moves through the same angle during a particular time interval (各点 的  ，， 相同)