The sum of the angles in a triangle is not always pi. It can be more or less depending on the curvature of the surface that the triangle lies on. This is a corollary of the famous Gauss-Bonnet theorem. According to G-B the sum of the angles is equal to pi (or "180 degrees") only when the curvature of the surface is zero, more than pi when the curvature is positive, and less than pi when the surface has negative curvature. Also, pi is most definitely not 3.1416. It has a non-terminating decimal expansion since pi is irrational (in fact, it is transcendental).
So yet another one post wonder pops up and gives bad marks on a 4 year old post. Interesting how you gave me a bad mark for asking a question. BTW Stratmando's two comments are correct. You may not think he answered the question but he was correct. Where were you 4 years ago??
The problem is that Stratmando (regardless of whether or not he answered the question) is not correct on either account. Don't just take my word for it; read a university level textbook on math. In particular, pick up a book on differential geometry for a solid exposition on this subject. The book by Wolfgang Kuhnel (Differential Geometry: Curves-Surfaces-Manifolds) should suffice.
To answer your last question though 4 years ago I was studying for my degree in Applied Math. I found this page during a search which quite honestly was not related to this question, but it seemed like the people on here were not qualified to answer the question.
I am about to replace all the trim in the house and am noticing that the door frames seem to be uneven. By uneven I mean the gap from the corner to trim is larger on the bottom than at the top. We live in a 1 story house this only occurs at a few doors. Would this be poor contruction or is the...