I recently came across a geometrical curiosity when trying to answer a relatively elementary geometry question. It uses a method of construction and some basic algebra in a way that I had not encountered before. In fact, I thought that the method was worth committing to my 'problem-solving' memory on its own virtues, even without the question which inspired it.
If I understand how this site works, I should post a 'minimum working example' version of the original question and answer it myself, because, in my opinion, the concept I [re]discovered is important to the community. However, how do I decide whether the method is really that important/interesting/nontrivial for more experienced people? Do I or do I not post a self-answered question?