Answer: AAA Similarity Postulate
Step-by-step explanation:
We know that an equilateral triangle has angles equal i.e. [tex]60^{\circ}[/tex] each.
When we consider any two or more triangle its size can be changed by some factor but the interior angles remains same as [tex]60^{\circ}[/tex] .
Therefore, by AAA similarity postulate all the equilateral triangles are similar.