Paper Ruler

March 9th, 2006 Chris
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Need a quick way to measure an object, but have no ruler handy? Try this:

Fold a piece of 8.5×11 paper from either top corner down to the side, being careful to line everything up straight.

Paper Ruler Diagram

A little bit of trigonometry tells us that the resulting diagonal edge is 12.02 inches, which is close enough for most uses.

Via Lifehacker

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