$\"\"$

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Height of the pyramid is $\"\"$ and its rectangular base measurements are $\"\"$ and $\"\"$ .

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Draw the side view of the pyramid with longer side of the base facing out side and height $\"\"$ is along the $\"\"$ axis.

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$\"\"$

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Observe the figure,

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Equation of the $\"\"$ is a line passing through the origin which is in the form of $\"\"$ .

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Where $\"\"$ .

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Here, $\"\"$ .

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Therefore, $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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Find the area function of the rectangular base.

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$\"\"$ .

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Substitute $\"\"$ in above expression.

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$\"\"$ .

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$\"\"$

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Find the volume of the pyramid by integrating the area with respect to $\"\"$ over the limits $\"\"$ to $\"\"$ .

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$\"\"$ .

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Substitute $\"\"$ in above expression.

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Volume of the pyramid is $\"\"$ .