Chords Enchanter

Ok hear me out, the way you can find what's the third note of a diminished chord is by finding the perfect fifth of the root note then going down a semitone, so since the perfect fifth for E is B, an E diminished would have A#/Bb for a diminished chord. I can't believe I had to rationalize it like this. I've been a musician for almost a decade and I still have not cared to study music theory lol. What am I doing with my life?

essentially a cute little interval exercise. <3 the one thing really left for wanting, now that i have completed all of the exercises in order, is that there is a "shuffle"/"random" button, so that i can keep playing endlessly, but not all of the same exercise type in the same order every time.