No.

Like all marking on the court, only ONE edge of the marking is relevant. The rest of the painted line/arc is just part of the court on that side of the relevant edge. The actual boundaries on the court indicated by the various markings are infinitely thin but painted with a thick stripe for visibility. No matter how thickly it is painted, the relevant boundary is always just one of its edges (with one exception that has two edges but only one at a time).

• The FT lane lines are in the lane
• The FT line is in the lane
• The 3 point line is in the 2-point area
• The division line is in the backcourt (from the perspective of the team with the ball as that is the only backccourt that matters)
• The center circle is in the jump circle
• The OOB lines are OOB.

In the case of the semi-cirlce, it is the outer edge just like every other line marking anything to to with the FT lane. The arc that marks the semicircle is in the semicircle. If the shooter is touching inside the semicircle and not touching outside of the semicircle, the shooter is in the semicircle (ignoring the vertical plane elements of the various lane boundary rules).

All of these points are made more clear when you recognize that the thickness of all of the markings of except the division line have "minimum" thicknesses but can legally be made much thicker and can even be solidly filled as in the case of the lane, semi-circle, jump circle, or 2-point area.

You can also look at the definition of the semi-circle....it has a 6' radius, not 5'10" with a 2" stripe that is no-mans land.

And so my point was that the OP, as stated, is not a violation.

I don't bounce the ball to the shooter until he/she is in the semi-circle.

But I once had a player step backwards and out of the semi-circle. Tweet.

Was watching a college game tonight, the Ft shooter hit the first then backed out of the circle for a few seconds then came back in and the L bounced him the ball after waiting patiently.

A Most Excellent Post ...
 

Camron Rust: Thanks for putting the time and effort into your post. It's legal for the shooter to have the back of his heel on the semicircle line. In terms of intellectual curiosity, this has been a fun thread, and I'm pleased that you brought some closure to it. All along I thought that edges were the real boundaries, so I was having trouble understanding how the entire thickness of the semicircle could be relevant. Thanks.

I would have thought Hawkeye's post would have sparked the same discussion. ;)

I didn't answer the question b/c honestly I don't know.

edit: Now thanks to Camron I do know.