A Tough Geometry Puzzle - SOLVED
Channel: 57Cell (Michael Hartley)
Date: 23/01/2016

My aunt sent my wife a geometry problem a while back - there's a triangle, with some lines inside, and some angles given. There's also one unknown angle marked as such, and the puzzle is to find that angle.

At first I thought that finding the missing angle would be really easy. It turned out to be way harder than I suspected, but the solution is really neat - beautiful, even. 

This video shows how to solve a slightly easier variant of the original puzzle from my aunt.