3 rectangular objects forming a triangle

These three objects we're not stars clearly. It was 4:18am and I was able to take five photos. The objects moved in synchronization but always in a triangle, from elongated to very tight. The objects moved as the sun was beginning to rise,suddenly two of the objects dissapeared or merged into one. The 5th picture shows what looks like a bright white like hot white and a glow or field of what looked like cold surrounding it. On the third picture there is a point where the 3 objects look like boomerangs wit perfect 90 degree angles that aligned to one another, not matter how far or close they were!