Height of the pyramid is and its rectangular base measurements are and .
Draw the side view of the pyramid with longer side of the base facing out side and height is along the axis.
Observe the figure,
Equation of the is a line passing through the origin which is in the form of .
Where .
Here, .
Therefore, .
Substitute in .
.
Find the area function of the rectangular base.
.
Substitute in above expression.
.
Find the volume of the pyramid by integrating the area with respect to over the limits to .
.
Substitute in above expression.
.
Volume of the pyramid is .
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