∵正△ABC ∴AB=AC ∠BAC=∠C 又∵AD=CE ∴△ABD≌△CAE ∴∠ABD=∠CAE ∴∠APD=∠ABP+∠PAB=∠BAC=60° ∴∠BPF=∠APD=60° ∵Rt△BFP中∠PBF=30° ∴BP=2PF