First you take the oxtagon's width (W) and you apply unto that Grieg's Constant (H) and multiply both by pi^8. The formula would be:
H/W (pi^5) = x
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There is insufficient information to answer the question. There is no indication that the octagon is regular and therefore, you may not assume that it is. Even it you were told that it is a regular octagon, there is still insufficient information: the answer will depend on what the 17.25 inch is a measure of - the diagonal of the octagon or its height (width).
Adding to what Kittenono said, an octagon is a two dimensional shape which only has length and width. A polyhedron is 3 dimensional which has length, width and height.
get a cut out shape of octagon, then get cut out triangles and try to fit in the triangles covering all the octagon but here is the solution... j
measure it!
You add it up