Answer:
The trinity by Masaccio showed humanism in the depth. The roof went back and made it seem more three dimensional and have more depth so it focused more on Jesus in the middle. and it used linear perspective to create more of a symmetrical balance to the painting. Also, the people have emotions, you can see their faces and they aren't just blank stares, they are clearly trying to reflect real life and put real emotions into a painting.
Hope that helped! :)