<P> The top of the hoop is 10 feet ( 305 cm ) above the ground . Regulation backboards are 72 inches ( 183 cm ) wide by 42 inches ( 110 cm ) tall . All basketball rims ( hoops ) are 18 inches ( 46 cm ) in diameter . The inner rectangle on the backboard is 24 inches ( 61 cm ) wide by 18 inches ( 46 cm ) tall . </P>
<P> The top of the hoop is 10 feet ( 305 cm ) above the ground . Regulation backboards are 72 inches ( 183 cm ) wide by 42 inches ( 110 cm ) tall . All basketball rims ( hoops ) are 18 inches ( 46 cm ) in diameter . The inner rectangle on the backboard is 24 inches ( 61 cm ) wide by 18 inches ( 46 cm ) tall . </P>
what is the diameter of an nba basketball hoop
what is the diameter of an nba basketball hoop
18 inches ( 46 cm )
18 inches ( 46 cm )