Triangle on a Sphere Question Interpretation

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SUMMARY

The discussion centers on the mathematical problem of tiling a unit sphere with equilateral triangles that meet at a vertex. It establishes that the only valid configurations for the number of triangles, denoted as n, that can converge at a single vertex are n=3, n=4, or n=5. The conversation emphasizes the geometric constraints imposed by spherical geometry and hints at the relationship between triangle angles and area, as well as connections to Platonic solids.

PREREQUISITES
  • Spherical geometry fundamentals
  • Understanding of equilateral triangles
  • Knowledge of Platonic solids
  • Basic principles of geometric area calculations
NEXT STEPS
  • Explore the properties of spherical triangles
  • Study the relationship between triangle angles and area on a sphere
  • Investigate the characteristics of Platonic solids and their relation to spherical tiling
  • Learn about the Euler characteristic in relation to polyhedra
USEFUL FOR

Mathematicians, geometry enthusiasts, students studying spherical geometry, and anyone interested in the properties of triangles on curved surfaces.

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Homework Statement


Consider a tiling of the unit sphere in ##\mathbb R^3## by equilateral triangles so that the triangles
meet full edge to full edge (and vertex to vertex). Suppose n such triangles meet an one
vertex. Show that the only possibilities for n are
## n=3 ##, ##n = 4##, or ##n=5##

Homework Equations


The Attempt at a Solution


I guess the main thing I need help with is interpretation of the question.

Thank you
 
Physics news on Phys.org
A (flat) triangle won't fit on the surface of a sphere. Do you mean spherical triangles?
 
Hint: there's a relation between the angles of a triangle and it's area. Figure out the area of a triangle if n of them share a vertex. How many will fit on a sphere? If you think about there is also a easy correspondence between these and some of the platonic solids.
 

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