PascalABC.NET
begin
var (x, y) := ReadReal2('Введите X, Y:');
if (x * x + y * y <= 9) and (x * x + y * y >= 4) and
(x <= 0) and (y >= 0) or
(x * x + y * y <= 4) and (x >= 0) and (y <= 0) then
Writeln('Да')
else
Writeln('Нет')
end.
