Given: △def df = ef prove: ∠3 = ∠4 which of the following statements would be the reason in line 4 of the proof? two ∠'s supplementary to equal ∠'s are = substitution definition of supplementary.

this isn't a question, nor is it appropriate for this web site

explanation:

you can't just go around joking about this kind of stuff.

answer:

i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!

answer:

explain more

explanation:

i don’t understand what you’re asking. elaborate more on that . also give me brainliest!