Angle bisectors of a quadrilateral

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  • Thread starter Thread starter dalcde
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Discussion Overview

The discussion revolves around the conditions under which the angle bisectors of a quadrilateral intersect at a single point. Participants explore geometric properties related to angle bisectors and the possibility of inscribing a circle within the quadrilateral.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the conditions necessary for the angle bisectors of a quadrilateral to meet at a single point.
  • Another participant hints at the relevance of perpendiculars in this context.
  • A participant suggests that the existence of a circle that can be inscribed within the quadrilateral, tangent to all sides, is linked to the supplementary nature of opposite angles.
  • The same participant expresses a desire for methods to determine the conditions for inscribing such a circle, indicating a potential connection to the incenter of a triangle.
  • A later reply mentions the Pitot Theorem as a resolution to the inquiry about inscribing a circle.

Areas of Agreement / Disagreement

The discussion includes multiple viewpoints regarding the conditions for angle bisectors and the inscribability of a circle, with no consensus reached on the initial inquiry.

Contextual Notes

Participants reference geometric properties and theorems without fully resolving the mathematical steps or assumptions involved in the conditions discussed.

dalcde
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What are the conditions to have such that the angle bisectors of a quadrilateral meet at a single point?

Btw, should I put this in the (Topology and) Geometry forums, or is it for more advanced geometry?
 
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hi dalcde! :smile:

hmm … angle bisectors :rolleyes:

hint: perpendiculars? :wink:
 
The perpendiculars are equal?

Actually that's what I was starting with. You can put a circle around a quadrilateral (enclosing the quadrilateral inside) if and only if opposite angles of the quadrilateral are supplementary. I wanted to know under what conditions will it be possible to put a circle inside that is tangent to all of the side. (analogous to the incenter of a triangle) If having equal perpendiculars is what you meant, I would be going in circles, unless you have some ways to determine if you can put a circle inside, which would be really appreciated.
 
Anyway, I've found the answer - Pitot Theorem. Thanks anyway.
 

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