Friday, August 7th, 2009
cropped-6a.jpg
http://peterbatchelder.files.wordpress.com/2009/08/cropped-6a.jpg
Friday, August 7th, 2009
http://peterbatchelder.files.wordpress.com/2009/08/cropped-6a.jpg
Drag the markers to each end of an object whose width you know
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