In the 2009-2010 NFHS CASE BOOK, this exact situation is given as an example.
on page 28 of the Case Book, under 4.19.3:
B1 is charged with an intentionalfoul on A1 who is in the act of shooting: (a) a successful two-point or three-point try; (b) an unsuccessful two-point try; or (c) an unsuccessful three-point try.
Ruling: in (a) and (b), A1 is awarded two free throws. in (c), A1 is awarded three free throws. In all situations ollowing the free throws, Team A is awarded a throw-in at the out-of-bounds spot nearest the foul.
pretty simple and straight forward.
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