You will find the CTRL, SHIFT, and ALT keys useful when transforming objects using the mouse. These commands can constrain an object's transformation by degrees, transform an object from its center, or transform it horizontally and vertically at the same time.
You can also change the number of increments by which you split, rotate, skew, or mirror an object. The default value for splitting, rotating, skewing, and mirroring while holding down CTRL is 15 degrees.
To cut, rotate, skew, or mirror an object in 15-degree increments
• Hold down CTRL while dragging with the mouse.
To change the number of increments by which you cut, rotate, skew, or mirror an object
1 Click Tools, Options and click Workspace, Edit.
2 Type a new value in the Constrain Angle box.
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