the proof of ABC = CDA is shown what is the missing reason in proof
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the proof of ABC = CDA is shown, the missing reason in proof are:
Consider the attached figure while going through the following steps:
In Δ ABC and Δ CDA
AB ║ DC (opposite sides of a parallelogram are parallel)
AD ║ BC (opposite sides of a parallelogram are parallel)
∠ ABD = ∠ CBD (alternate interior angles are same)
∠ ADB = ∠ CDB (alternate interior angles are same)
DB = DB (common side)
∴ Δ ABC ≅ Δ CDB
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