∵正五边形,∴AB=EA,∠EAB=108°,∴∠EBA=∠BEA=36°
∵AE=BC,AB=AB,∠EAB=∠CBA,∴△EAB≌△CBA,∴∠CAB=∠EBA=36°
∴∠EMA=∠EAB=72°,ME=AD=AB