Take the first page, and fold from either top corner down to the side, lining up the side carefully, making a right triangle.Of course, dollar bills work great too!
Remember how you thought you'd never use trig? Well you were right, because I just used it for you. One ABC and three squares later, the hypotenuse of the right triangle you've created is 12.02 inches - very close to being exactly one foot.
Hattip to LifeHacker for linking to this.
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