What are the missing reasons in the proof?

Given: parallelogram upper A upper B upper C upper D with diagonal modifying above upper B upper D with bar
Prove: triangle upper A upper B upper D congruent to triangle upper C upper D upper B

What are the missing reasons in the proof Given parallelogram upper A upper B upper C upper D with diagonal modifying above upper B upper D with bar Prove trian class=
What are the missing reasons in the proof Given parallelogram upper A upper B upper C upper D with diagonal modifying above upper B upper D with bar Prove trian class=