Standard basketball court dimensions for a high school court. Remember that the NCAA has moved the three point line back one foot.  The NCAA three point arc radius is now 20 feet 9 inches.  The high school three point arc stayed the same at 19 feet 9 inches. 

Basic Dimensions:

Width: 50 feet

Length: 94 feet

Free throw line to backboard: 15 feet

Backboard Dimensions: 6ft wide  x 3.5 ft tall

Basketball Rim Diameter: 18 inches

Rim Height: 10 feet 

NCAA Basketball Court Layout with longer three point line.