The relative angles are congruent
Yes, they are.
Yes. Similar triangles have equal corresponding angles, and so do congruent triangles.
No, congruent triangles are always similar but similar triangles and not always congruent. Imagine that similar triangles can be created on a copy machine enlarge and shrink the image, turn it, even turn it over, the angles remain the same. A congruent triangle must be exactly the same as the original. Hope this helps!
The triangles are similar, but not necessarily congruent.
No, they are similar. They may be congruent, but they need not be.
They're similar triangles.
Such triangles are similar.