# One Property of the Equilateral Triangle

Given is an equilateral triangle ABC and a point D on the ray CB. Let x, y, z be the distances from the point D to the vertices A, B and C, respectively.
Prove that if point D is between A and B, ,and if point D is not between A and B, then .

**See**: Math. Mag. 88 (2015) 186## New Resources

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