Problem #65: Where There's a Will

A father wishes to divide a square piece of land among his five sons. One son is his favorite, and he wants to give him one quarter of the land, as shown: 
+-------+-------+
|       |       |
|       |       |
|       |       |
+-------+       |
|               |
|               |
|               |
+---------------+
How can he divide the remaining land into four plots of equal size and shape?
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