BP=2PQ
证明:
∵等边△ABC
∴AB=AC,∠BAC=∠ACB=60
∵AE=CD
∴△ABE≌△CAD (SAS)
∴∠ABE=∠CAD
∴∠BPD=∠ABE+∠BAD=∠CAD+∠BAD=∠BAC=60
∵BQ⊥AD
∴BP=2PQ