let us draw a line PQ parallel to AB and CD
then <DPB=<QPB+<QPD
<QPB=<ABP=30° (alternate angles)
<QPD=<CDP=45°(alternate angles)
<DPB=30+45=75°
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let us draw a line PQ parallel to AB and CD
then <DPB=<QPB+<QPD
<QPB=<ABP=30° (alternate angles)
<QPD=<CDP=45°(alternate angles)
<DPB=30+45=75°