According to the National Basketball Association, basketball courts should be rectangular shapes that are 94 feet long and 50 feet wide, with inner dimensions including a 23 foot, 9-inch semicircular three-point arc at either end of the court; however, dimensions for other leagues and age groups may differ. For example, middle and high school courts are typically smaller than regulation NBA size, although the NCAA, or college league, and WNBA, or women's pro league, use the same court dimensions as the NBA. In all of the above-mentioned courts, the free throw line is situated exactly 15 feet away from the point on the floor that corresponds with the hoop's backboard location.
Additional dimensions for regulation NBA courts include a center circle that is 12 feet in diameter, and a hoop rim that is 10 feet off the ground. The court is marked by symmetry, with a clean line splitting the court into two equal halves with identical marks, measures and features, including a basket on either end. Indoor basketball arenas typically use hard wood as their flooring, and include painted lines to indicate areas such as the free throw line and the three-point arc. Outdoor basketball courts typically feature paved floors.