Stomachion
Playing around with mrzcasali's: https://www.geogebra.org/m/C9g6hH44
I had to make a new version of my own. Finally updated where you can flip the shapes by clicking on them! Note one hint mentions blue triangles, but they're purple!
Mathematicians have found ways to find all possible solutions, as well as all the convex shapes that can be made with these tiles.