Cube Triangle Picking
Pick 3 points at random in the unit 
-Hypercube. Denote the probability that the three points form an Obtuse Triangle 
. Langford (1969) proved
See also Ball Triangle Picking, Cube Point Picking
References
Finch, S. ``Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/geom/geom.html Langford, E. ``The Probability that a Random Triangle is Obtuse.'' Biometrika 56, 689-690, 1969. Santaló, L. A. Integral Geometry and Geometric Probability. Reading, MA: Addison-Wesley, 1976.
- Ptolemy's Theorem
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