Preset Rotation Angles
The rotate commands provide a number of ways to rotate 2D and 3D objects in a drawing without changing their base location in the drawing. Select one of the preset rotation angles, or specify a custom rotation angle.
To rotate at a specified angle:
1.
2.
Select Modify > Rotate, and then the pre-set rotation. Alternatively, select Rotate from the object context menu.
 

Common Functions and Utilities : Rotating Objects : Preset Rotation Angles

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