Coach, there's no difference in the rules about when the ball hits the sides of the backboard. All the sides are in play for both fan-shaped and rectangular backboards. The back is OOB on both types as well. So there's no difference in rulings when the ball touches the backboard.
The difference is that it's a violation for the ball to go over a rectangular backboard but it's not a violation for the ball to go over a fan-shaped backboard. (7-1 Note)
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Any NCAA rules and interpretations in this post are relevant for men's games only!
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