The backboard of a Basketball goal is typically 1.80 meters by 1.05 meters in area. The diameter of the rim of the basket is 0.45 meters.
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The standard size of a basketball backboard is 6 feet wide by 42 inches tall. The inner rectangle on the board is 24 inches wide by 18 inches tall.
Regulation backboard sizes are the ones most commonly used in the NBA as well as in other areas. They are six feet wide by 42 inches tall.