# Should be simple puzzle

**URL:** <https://boards.straightdope.com/t/should-be-simple-puzzle/171224>\
**Category:** Factual Questions\
**Created:** [April 26, 2003, 12:52am UTC](https://boards.straightdope.com/t/should-be-simple-puzzle/171224 "2003-04-26T00:52:16Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![Q.E.D](https://avatars.discourse-cdn.com/v4/letter/q/51bf81/32.png) [@Q.E.D](https://boards.straightdope.com/u/Q.E.D)\
**Post date:** [April 26, 2003, 4:21pm UTC](https://boards.straightdope.com/t/should-be-simple-puzzle/171224/21 "2003-04-26T16:21:43Z")

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I think most geometers would consider those to be two separate triangles sharing a common vertex. My reasoning for concurring with this viewpoint is that the interior space is not contiguous:

> [@](#):
>
> polygon  
> noun a closed plane figure bounded by three or more straight sides that meet in pairs in the same number of vertices, **and do not intersect other than at these vertices**.

From [wordreference.com](http://www.wordreference.com/English/definition.asp?en=polygon).

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