sympy/sympy — pull request #1286 by smichr (2012-05-10 11:36:47+00:00)
Title: better intersection of LinearEntities detected

Also, alternate Triangle instantiations: asa, sas, sss added to polygon.py

and helpers added to polygon (and imported into namespace):

deg(x) converts x to degrees from radians
rad(x) converts x to radians from degrees