Volume of a Rectangular Frustum
Calculate the volume of a solid with rectangular top and bottom faces using the two side lengths of each face and its height.
Both the top and bottom faces are rectangles, and the edges a and A, as well as b and B, are parallel. (Obelisk shape)

| Volume V |
| \(\normalsize Obelisk\\ (1)\ volume:\hspace{20px} V={\large\frac{h}{6}}(Ab+aB+2(ab+AB))\\\) |
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