Sometimes, you need to create a perfectly square or circular selection. Finding out how to make accurate selections is one of those skills that’s well worth the time you invest.
To do so, simply press the Shift key after you begin dragging. After you make your selection, release the mouse button first and then release the Shift key. You can also set the aspect ratio to 1:1 in the Options bar.
When you’re making an elliptical selection, making the selection from the center outward is often easier. To draw from the center, first click the mouse button where you want to position the center, press Alt (Option on the Macintosh), and then drag. When you make your selection, release the mouse button first and then release the Alt (Option on the Macintosh) key.
If you want to draw from the center outward and create a perfect circle or square, press the Shift key, as well. After you make your selection, release the mouse button and then release the Shift+Alt (Shift+Option on the Macintosh) keys.
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Source:http://www.dummies.com/how-to/content/create-perfect-square-and-circle-selections-in-pho.html
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