El Don

Rodriguez is a happy and content farmer. He has got a square field of side length $x$. Miguel, his son has himself grown into a man and his father wants to gift him something out of which he can make a living. So he gift's his son a square piece of land cut out from a corner of his field of side length $ y (y < x) $ leaving him with a L-shaped land. But in Spanish tradition, it is considered in