Is there a quick way to figure out the circumference of a circle in Illustrator without being a math wiz? Sure but only if you know the secret place to find the information. Click with the Ellipse tool (L) to open its Options window, and type in "1 in" for the Width and "1 in" for the Height and click OK. You end up with a circle with a 1/2" radius (1" diameter). But how can you find the circumference? With the circle still selected, open your Document Info panel (Window>Document Info) and select "Objects" from the panel's Option menu. The circumference information is revealed in general information in the very first listing in the panel – "Paths: 1 (0 open, 1 closed, 4 points, length = 3.142 in)" The Length of the entire path (or its circumference) is 3.142. I'm sure all of the math wiz's out there are about to put this information to the test using a variety of different sized circle. To give it a try, use the geometric formula for circumference (2∏R) or 2 X 3.142 X the Radius (1/2 the Width of the circle).
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