Geometry Problem: Machu Picchu Inca Trail

 Problem 240. Triangle with Equilateral triangles, Parallelogram

In the figure, equilateral triangles ABC', BCA', and ACB' are constructed on the sides of a triangle ABC. Prove that A'BC'B' is a parallelogram. Post a comment.
  

Equilateral triangles and parallelogram 

 

See also: 

  Equilateral Triangle
  Parallelogram

Triangle with equilateral triangles

 

 

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