Math CentralQuandaries & Queries


Question from Chris, a student:

I am trying to figure out the volume of a regular octagonal prism, with side lengths of 4 inches. How do I do this?


Since you only give one length, 4 inches, I am going to assume that your regular octagonal prism is a right prism and its height is 4 inches.

octagonal prism

In that case the volume is the area of the octagon times the height of 4 inches. The area of a regular octagon can be found using our note on finding the area of a regular polygon.


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