You can rotate or flip multiple images at preset angles.
To Rotate or Flip an Image:
Rotate / Flip Angles
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                         | Rotates the image counter-clockwise 90 degrees. | 
| 
                         | Rotates the image 180 degrees. | 
| 
                         | Rotates the image clockwise 90 degrees. | 
| 
                         | Rotates the image according to any EXIF data contained within the image. (Does not affect images without EXIF information.) | 
| 
                         | Flips the image along the vertical axis. | 
| 
                         | Flips the image along the horizontal axis. | 
| 
                         | Flips the image along the vertical axis, and then rotates it counter-clockwise 90 degrees. | 
| 
                         | Flips the image along the vertical axis, and then rotates it clockwise 90 degrees. | 
You can also use the Rotate tool in Edit mode to rotate an image using a custom angle of rotation.