∵AE=CD,AB=BC=AC
∴△AEB∽△CDA
∴∠PAE=∠ABP
又∵∠ABE+∠BAP=∠APE
∴∠APE=∠ABE+∠BAP=∠BAP+∠PAE=60°
∴∠APE=∠BPQ
∵△BPQ为Rt△,∠BPQ=60°
∴BP=2PQ