Hold left click and spin it in the direction you want the object.
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To turn it left press < button to turn it right press > button
In the Sims 3 for Pc/Mac, trees act like objects, so as long as they are in your lot, you should be able to pick them up with the hand tool, and move, rotate or delete them as you wish.
Go to Buy Mode and grab the furniture you want to rotate then press the keys to rotate it.
To rotate objects in Halo Reach's forge hold down the left trigger
click tools, grab mode, click on an item, press z