Which equations are true?


Choose all answers that are correct.




A.

m∠3 = m∠1 + m∠2


B.

m∠3 = m∠1 – m∠2


C.

m∠1 = m∠2 + m∠3


D.

m∠1 = m∠2 – m∠3


Please help and thank you