It has an interesting idea on how to do that, but it does cite a real discussion about fourth sides of triangles: https://mathoverflow.net/questions/401456/the-

It has an interesting idea on how to do that, but it does cite a real discussion about fourth sides of triangles: https://mathoverflow.net/questions/401456/the-4th-vertex-of-a-triangle https://mathoverflow.net/questions/401456/the-4th-vertex-of-... and the paper mentioned there does resemble its output for me.