Basketball points are scored through shooting, dunks, three-point shots, and free throws. A free throw allows players to shoot with less interference, making it easier to score. Free throw percentage plays an important role in a basketball game. This study explored the relationships among free throw percentage, shooting angles, and entrance area using two different sizes of basketballs. The findings revealed that free throw percentage could be influenced by shooting angles. Additionally, this study demonstrated the relationship between free throw percentage and entrance area. The results of the independent t-test indicated a significant difference in shooting angles when comparing the two different sizes of basketballs.

Keywords：Free Throw、FTP(Free throw percentage)