Answer :
In ΔAPB and Δ DPC,
∠APB = ∠DPC = 50°
By SAS property, Δ APB
DPC
∠PBA = ∠DPC
In Δ DPC,
∠D + ∠ P + ∠C = 180°
∠ C = 100°
∴ ∠PBA = ∠DPC = 100°
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