Sunday

May 29, 2016
Posted by **Nathalie ** on Saturday, July 13, 2013 at 6:45pm.

- geometry -
**Steve**, Saturday, July 13, 2013 at 6:49pmuse your calculator for arctan(3.5) or tan

^{-1 }3.5

or use any of the many online calculators.

It's not a rational number, or even a rational multiple of pi.