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Let \(L\) be on the x axis and \(W\) be on the y axis.

In the x-z plane, we have the line \(z = -\frac{h}{L/2}x + h\), and in the y-z plane, we have the line \(z = -\frac{h}{W/2}y + h\).

My cross sections has width \(\Delta z\). So I want to find the volume \(\int_0^hA(z)dz\).

How can I do this?