l>Octagonal Sheight Sign

Subject: Octagonal Soptimal Sign Name: Phil Who are you: Teacher

Hello! My colleagues and I are in a discussion about just how many type of true "sides" an octagonal soptimal sign has actually. I say that it has actually 10 true sides bereason of the front ago sides of a sheight sign (3D octagon). Is this correct terminology or have to the front and also ago "sides" be referred to as faces -- equaling 2?


Hi Phil,

By mathematical definition, an octagon is an 8 sided 2-D form. A speak sign, technically, is not 2-D, so it is not an octagon. A speak authorize is 3-D, and has 10 faces. We can take into consideration just the front face of a speak authorize, which would certainly be an octagon (currently, we are ignoring the thickness of the sign, and also it has actually 8 sides). It is prevalent place to describe a stop sign as an octagon, bereason it has 8 edges approximately it"s front challenge - this is informal language that is fine for day-to-day interaction, yet is not acceptable in within the exact language of mathematics.

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Hi Phil,


I agree completely with Paul"s response yet I desire to add somepoint. An octagon is an 8 sided 2-D form yet in describing the 3-D "soptimal sign" form (I drew one below that is thick sufficient that you deserve to view the third dimension) mathematicians usage the terms vertices, edges and also encounters.


I have actually constantly assumed that they execute so exactly bereason the term "side" carries connotations in English that provide rise to exactly the ambiguities that you and also your colleagues detected.


my 2 cents worth:

Technically, a "side" is not a mathematically exact term, so mathematicians stop it. However, even we usage the term "side" in the same loose means that everyone else does, so really we are searching for a bridging definition that supplies even more precision for the word "side" without breaking any type of of its typical etymological interpretations.

I would propose that a "side" be one measurement less than the object whose side it is. For example, the side of an octagon is 1 dimension (so it is component of a line) considering that an octagon is a 2 dimensional shape. A side of a cube is a two-dimensional form (part of a plane).

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Curved surencounters still pose a trouble and although we can proceed to refine our definition, I suppose shapes like the möbius sexpedition and the Klein bottle will certainly proceed to vex us. Look these up if you are curious about why.