Triangles in different geometries

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SUMMARY

This discussion focuses on the properties of triangles in different geometries: Euclidean, elliptic, and hyperbolic. In Euclidean geometry, the sum of the interior angles of a triangle is always 180 degrees, while in elliptic geometry, the sum exceeds 180 degrees, and in hyperbolic geometry, it is less than 180 degrees. The relationship between interior and exterior angles remains consistent across these geometries, where each interior angle plus its corresponding exterior angle equals 180 degrees. Understanding these differences is crucial for comprehending the broader implications of non-Euclidean geometries.

PREREQUISITES
  • Basic understanding of Euclidean geometry
  • Familiarity with elliptic and hyperbolic geometries
  • Knowledge of angle relationships in geometry
  • Ability to interpret geometric properties and theorems
NEXT STEPS
  • Research the properties of triangles in elliptic geometry
  • Explore hyperbolic geometry and its implications on triangle properties
  • Study the relationship between interior and exterior angles in various geometries
  • Read the article on non-Euclidean geometry on Wikipedia for foundational knowledge
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Mathematicians, geometry enthusiasts, educators, and students interested in the principles of non-Euclidean geometries and their applications.

GeometryIsHARD
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So it has come to my attention that 'different geometries' have different rules for the interior angles of a triangle... What are these different rules for Euclidean, elliptic and hyperbolic geometry? What I'm really wondering though is what knowing these rules about the interior angles tells us about the extiorior angles. does the interior angle + exterior angle have to equal 180 degree's or something? Thanks for anyone with some insight!
 
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GeometryIsHARD said:
So it has come to my attention that 'different geometries' have different rules for the interior angles of a triangle... What are these different rules for Euclidean, elliptic and hyperbolic geometry? What I'm really wondering though is what knowing these rules about the interior angles tells us about the extiorior angles. does the interior angle + exterior angle have to equal 180 degree's or something? Thanks for anyone with some insight!
Have you already read the article on Wiki on non-Euclidean geometry?
https://en.wikipedia.org/wiki/Non-Euclidean_geometry
 

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