4 ms·
> the pentagon (or really any five-sided polygon) An odd line. Surprising given the quality of the rest of the article.
by drdeca 6y ago
> the pentagon (or really any five-sided polygon)
An odd line.
Surprising given the quality of the rest of the article.
- lainga 6y agomaybe it's a regularising "the", like "the Moon" vs. "a moon"... "the" regular pentagon, vs., etc.
- thaumasiotes 6y agoThe use of "the" isn't the weird part. The weird part is that the article attempts to draw a contrast between "pentagons" and "five-sided polygons", which are exactly the same thing.
- waluigi 6y agoI think what the poster above is saying is that by saying "the pentagon" the author is referring to the (unique) 5 sided regular polygon, as opposed to some random, potentially non-regular 5 sided polygon.
- thaumasiotes 6y agoThat would not stop it from being a bizarre error in an otherwise decent article. There is no such use. I interpreted it in the same way as e.g. "the cow has four stomachs". This is a question about graph theory anyway; there are no side lengths or interior angles.
- frogpelt 6y agoPentagons are 5-sided polygons where all the sides are equal. Not all 5-sided polygons are pentagons. What am I missing?
- MadcapJake 6y agoWhat you're describing is called a regular pentagon.
- karmakaze 6y agoThe pointlessness in the distinction is that we're talking about graphs defined by their vertices and edges, not how they're drawn. (Planar graphs about how they 'could' be drawn not withstanding.)
- thaumasiotes 6y agoNo, it isn't; a regular pentagon has all equal side lengths (as described) and all equal interior angles (not as described).
- thaumasiotes 6y agoYou are missing the definition of a pentagon; try to avoid just making up definitions for words you don't know.
- dataflow 6y agoI don't really tend to think of non-convex five-sided polygons as pentagons (even if they technically are), and I'm guessing they wanted to emphasis those are included too.