How to determine whether a point with coordinates (x; y) belongs to the shaded part of the plane?

Question

Programming

thanks in advance would be very grateful for the formulas

Answer 1

1. 0 <= x <= 6
2. -6 <= y <= 6
2. sqrt(x*x + y*y) <=6
3. y >= x-6

Answer 2

In my opinion condition 2 is superfluous - it will be executed automatically.