Q: How many octagons are needed to make an octagonal prism?

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2 octagons (floor and roof), 8 rectangles (walls).

24

Strictly speaking, no, because a semi-regular tessellation must be based on regular polygons and rhombi are not regular polygons. However, octagons and rhombi can be used to make a non-regular tessellation.

Triangles or squares or hexagons. There are also mixtures, like octagons plus squares.

A rectangular prism.

Related questions

2 octagons (floor and roof), 8 rectangles (walls).

24

i think 14 but im not sure..a total guess actually sorry

Octagons do not make a neat repeating pattern when placed next to each other. Hexagons do make a perfect pattern called a tessellation. To make a continuous grid that includes octagons, you would need to incorporate squares and triangles to fill all the holes in between the octagons. It is much easier for almost brainless insects to make a pattern that is only a single repeating shape than to have to remember how to organize several different shapes.

6 sides are needed

Yes, you can make 768 ÷ 8 = 96 separate octagons.

15 straws are needed

It depends on what type of prism you're using (e.g. triangular prism).

15

seven

6

9