The correct answer is: 2:1. There are no critical points in the feasible domain. Since there are no critical points, we need to consider the boundary points. Now \((\frac{l}{2})^2=b^2=>I=2b\) \(\frac{l}{2}=\frac{2}{1}\) Therefore, the ratio of the larger side to the smaller side of the rectangle with the largest possible area inscribed in a semi-circle is 2:1.