The volume of the prism is
From the diagram bases of the prism are rectangles. so, use the area of the rectangle to find B.
\Area of a rectangle is . So,
.
(Substitute 4 for l 5.1 for w)
(Multiply:
)
(Apply Formula for volume of a prism)
(Substitute 20.4 for B 9 for h)
(Multiply:
)
The volume of the prism is .