Geometry, Theorems and Problems

 Problem 259. Equilateral Triangle, Incircle, Tangency Points, Side, Distances, Squares

The figure shows an equilateral triangle ABC. If a point D is on the incircle, E, F, and G are the points of tangency, DE = d,
DG = e, DF = f, and AC = a, prove that To Prove. View or post a solution.

Problem 258: Equilateral triangle, Incircle, Distances
 

See also: 

  Median length, Apollonius' Theorem
  Euclid's Elements Book II Proposition 13
  Problem 257
  Problem 256
  Equilateral Triangle

 

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