Well I have been contemplating, cogitating, googling and not understanding the golden triangle. In an attempt to do something for the current bud-19 challenge here is my offering.
I sort of get the principle when looking at landscapes and I totally understand the rule of thirds but for me the golden triangle is something that needs to be played as a percussion instrument only. Waiting for that eureka moment but it’s not happening in a hurry.
I think I did a shot that I tried to set up as a golden triangle composition. Very difficult for me. I believe though that you met your challenge. (I'm drawing lines in my head.)