Julie, I'd say go with the line as per the restraining line rule.
If, however, you were to go with an arc, just remember that it would have to be a somewhat modified arc - what with the three foot "spot" for the inbounder. I think it's just easier to give the three feet the whole way (on a normal court, the defender can't cross the OOB line to block the pass if he's downcourt), with a reasonable exception for players 10-20 feet or more downcourt.
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