Question

What theorem could you use to prove that the triangles ABC and DEF are similar?

1) SAS
2) SSS
3) AA

Answer 1

2) SSS

Explanation:

As you can see the given is a ratio between the sides of triangle ABC and DEF and the ratios are all equal proving that indeed triangle ABC is similar to triangle DEF by either magnification or minimization, and thus the theorem that you could use is SSS.