You can quickly rotate any selected object interactively by viewing the object bounding box and rotating with the Selection tool.
With the bounding box displayed, you simply hover near a corner or side point of an object's bounding box (with the Selection tool). As you do, the Selection tool cursor turns into a double-headed, curved arrow. Click and drag clockwise or counterclockwise to rotate the selected object (Figure 38a).
Figure 38a Rotating a selected object.
The Rotate tool rotates objects with more precision and control than you get by simply using the Selection tool. To rotate a selected object precisely with the dialog, double-click the Rotate tool. The Rotate dialog appears. Enter a value in the Angle area of the Rotate dialog to set the degree of rotation. The Copy button in the Rotate dialog allows you to create a second, rotated version of your selected object while leaving the original unchanged.
The Preview check box allows you to view changes on the artboard as you make them in the dialog before you click OK (Figure 38b).
Figure 38b Previewing rotation.
The most powerful and fun application of the Rotate tool is to rotate objects using a selected anchor point as the rotation pivot. To do that: