The proof that vertical angles 1 and 3 are congruent is started below. Which statement might be next? answer choices: A. m∠1 + m∠2 = m∠2 + m∠3
B. m∠3 + m∠4 = 180°
C. m∠1 + m∠2 = m∠2 + m∠1
D. m∠2 + m∠4 = 180°
What could also be proved true from the diagram? (THIS ONE I NEED MORE HELP WITH, PLEASE!)
answer choices: A.∠1 ≅ ∠2
B.∠3 ≅ ∠4
C.∠2 ≅ ∠3
D.∠2 ≅ ∠4