Question

Diana and Joby wrote the following proofs to prove that vertical angles are congruent. Who is correct?

Answer 1

Diana doesn't show how the angles are congruent to each other, so her proof is wrong

If you look at Joby's proof, his starting assumption is that vertical angles are congruent. This is a flawed proof, so his is also wrong.

Backup: http://openstudy.com/study#/updates/4ff2184ee4b03c0c488acc0d