what is the normal size of a basketball backboard?
In recreational environments, a backboard may be oval or a fan-shape, particularly in non-professional games. The top of the hoop is 10 feet (305 cm) above the ground. Regulation backboards are 6 feet (183 cm) wide by 3.5 feet (107 cm) tall. All basketball rims (hoops) are 18 inches (46 cm) in diameter.