Pass Goes Behind the Backboard, Through the Supports

[Back In The Saddle]

For those whose books are not readily at hand...

NFHS 7-1-2: ART. 2 . . . The ball is out of bounds:
b. When it passes over a rectangular backboard.

NCAA 7-1-3: Art. 3. The ball shall be out of bounds when any part of the ball passes over the backboard from any direction.

Had never really thought about it before, but I suppose a pass from one side of the key to the other, that passed over a rectangular backboard the long way, would also be illegal.

Question for the brain trust...How much of the ball must pass over the backboard? If only a portion of the ball passes over the corner of the backboard, is that illegal? Must it be the entire ball?