Question

△ABC ~ △DEFcan be read as which of the following?

Triangle ABC is not similar to triangle DEF.
Triangle ABC and triangle DEF are the same triangle.
Triangle ABC is congruent to triangle DEF.
Triangle ABC is similar to triangle DEF.

Answer 1

"△ABC ~ △DEF" reads as: Triangle ABC is similar to triangle DEF.

This means their corresponding angles are equal and corresponding side lengths are proportional (not necessarily equal, so they may or may not be congruent).