Jurassic Referee wroteNFHS rule 1-3-2NOTE says that "the continuous 2-inch wide outline must be clearly visible to the officials". That's the same as "clearly defined" for all practical reasons imo.
The key to that is "to the officials." Even the graphic that was shown was not as good as the picture I showed at least when looking at the 3 point line.
I was aware of the wording, but it does not say it has to be anything to those watching from a far. That is why there can be a shadow line and anyone on the court can clearly see the line. Case in point the Conference and NCAA Tournaments.
Peace