I still have difficulties understanding on a high level why lengths in triangles can produce irrational numbers. I guess once you accept that area in two dimens

I still have difficulties understanding on a high level why lengths in triangles can produce irrational numbers. I guess once you accept that area in two dimensions involves multiplication, it is a necessary consequence. I wonder what it means for projects such as wolfram physics where space is discrete. Do truly right angled triangles even exist in nature?