Volume of Truncated Octagonal Prism

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I was looking for the volume of this octagonal prism shown below. It looks like this:

It seems that I couldn't think of a formula that could give a volume that is specific to the problem above. I could think of formulas like $V = \frac{h}{3} \left ( A_1 + A_2 + \sqrt{A_1 A_2}\right ),$ which is, I think, I wrong, because there are different heights if I run my eyes through past the figure.

What is the volume of the octagonal prism above?

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1 Answer

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The volume of this shape is equal to the volume of a whole prism divided by two.

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