Picture of the month
![](http://upload.wikimedia.org/wikipedia/commons/1/14/Bisection_construction.gif)
Credit: Ixnay
In compass and straightedge constructions an angle can be bisected, divided evenly in to two, using only an unmarked ruler and a compass as seen above. Many tried and failed to trisect a general angle in this way; Gauss proved it impossible.
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