Octagonal Prism

A one stop resource

The octagonal prism is, like the hexagonal prism, not a commonly studied prism at elementary level.  

At the very most, your child will have to be able to identify the shape and count its vertices and edges.

Your child will most likely never have to calculate either the volume or the surface area UNLESS.. a value for the area of the octagon is given.  Then the surface area and volume are very elementary calculations.

The Facts


Cross Section


TEN - The front and back faces (2) which are octagons, and eight rectangles (8) which connect them.


16 Vertices


24 Edges

Surface Area

Where: l = distance from front face to back face


Where: l = distance from front face to back face; B =  Area of Base

Area of Octagon

Your student is not expected to know or use this formula, I have put it here for interest purposes only.

If your child is expected to find the area of an Octagon, it will be by calculating the area of triangles, when they are given the value of the Apothem.  Click the button below to get a full explanation of this method.

I am sure you will find all the information and worksheets you need here, however if there is anything you cannot find please don't hesitate to contact me or simply visit the K6Math CafĂ© and join the conversation!

I love to hear from my readers, and with a little feedback and a few suggestions I can make this a great resource for parents, teachers and tutors alike.

Be sure to explore everything on this site starting at the home page.

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