Pythagoras shows us how to find the 3rd side length on a right angled triangle where the two lengths connected by the 90 degrees are known.
Additionally there is a surprisingly short equation that I can't find that gives a third length where any other two lengths are known regardless of the inside angles of the triangles corners. What is this equation?
Is there a similar equation for knowing only the inside angles of two corners and finding the third, if so what is it?
Also are there any other very general, or even more general triangle equations showing relationships between a triangles side lengths and inside angles of the corners given wide ranges of possible just enough information.