if your rise is 7.25" and your tread is 11.5" but you also have a 3" nosing is this legal
Its going to matter where in the world you are as looking at your localbuilding code will tell you if it is legal, but from the common sense side, there is a reason why a nosing of ~1" give or take 1/2" is typical - becasue it is safer than 2" or 3" or 1'.......

I'm going to bet a 3" nosing is not allowed in your area (or any???) but again, check the code. It promotes a tripping hazard.