What does it mean: "reach smth"?
It's a strict condition, but how should i understand it?)
In my opinion, this sample has two right answers:
4
0 0
0 1
0 5
0 8
2 * (1.5 * 1.5) * M_PI or (1 + 3 * 3) * M_PI.

You have to find the largest possible answer.

Thus the correct answer is: (1 * 1 + 3 * 3) * M_PI =
31.4159