Answer:
It is enough to show that all three pairs of corresponding sides are in the same ratio.
It is enough to show that two pairs of corresponding angles are congruent.
Step-by-step explanation:
If you know that the corresponding sides have the same ratio, then both triangles will be similar (SSS Similarity)
If 2 corresponding angles are congruent, you know the 3rd one is too (Triangle Angle Sum) which makes the triangles similar (AA Similarity)