Regulation backboards are 6 feet wide (72 inches) by 42 inches tall. All Basketball rims (hoops) are 18 inches in diameter. The inner rectangle on the backboard is 24 inches wide by 18 inches tall.
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It can depend entirely on the type of ball used and how many the panels the ball has. On average, a basketball used in NBA D-league play will have 6 panels. Each panel will be roughly 5 inches.