Respuesta :
In this item, we are given that the three pairs of corresponding sides of the triangles are congruent because they were given to have the same measurements. The postulate or theorem that therefore proves that these triangles are indeed similar is the SSS which stands for Side – Side – Side.
It is the SSS theorem, we don't have a missing side and there are no angles so it has to be SSS (Side-Side-Side) theorem.