Complete the two-column proof by providing the missing statements or reasons. Given:
ABCD is rhombus
Prove: ∠1≅∠2

StatementReason
1.1. Given
2. AD = BC = CD = BA 2.
3. DO = OB ; AO = OC 3. Diagonals of a parallelogram bisect each other.
4.△DOC ≅△BOA 4.
5.∠1 ≅∠2 5.

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