In the figure below $WXYZ$ is a rectangle with $WX=8$ and $WZ=16$. Point $M$ lies on $\overline{XY}$, point $A$ lies on $\overline{YZ}$, and $\angle WMA$ is a right angle. The areas of $△WXM$ and $△WAZ$ are equal. What is the area of $△WMA$?