Cut a Cake

We found this problem on  http://mathpuzzle.com.
A cake with a corner missing can be cut into 7 unequally sized pieces with 3 cuts, following the gridlines. None of the cuts cross themselves, and each crosses the other cuts exactly once. Following these rules, cut the cake into 7 equally sized pieces with 3 cuts.

Can any find an equality 4-cut, with 11 pieces?