18. What is the probability to win the game

David playing a game with his friends, in which the stone thrown by them landing in a circular region (given in the figure) is considered a win and landing other than the circular region is considered a loss. If the value of $x = 7$ feet and $y = 4$ feet, what is the probability of winning the game?

 

 

 

• $\frac{314}{2921}$
• $\frac{3.14}{2800}$
• $\frac{314}{2800}$
• $\frac{2800}{314}$