如图,已知：在Rt△ABC中,∠C=90°,BD平分∠ABC且交AC于D.若AP平分∠BAC且交BD于点P,求∠BPA的

∠ABP=1/2∠ABC
∠BAP=1/2∠BAC
∠BPA=180-∠ABP-∠BAP=180-1/2∠ABC-1/2∠BAC=180-1/2(∠ABC+∠BAC)
因为∠ABC+∠BAC+∠C=180
∠C==90
所以∠ABC+∠BAC=90
所以∠BPA=180-1/2(∠ABC+∠BAC)=180-45=135