∴△BFD is an equilateral triangle
∴AF=AB-BF=BC-BD=DC
∫∠ADE = 60
∴∠ADB+∠CDE= 120
∫∠FAD+∠ADB = 120
∴∠FAD=∠CDE
∫∠AFD = 120
∠DCE=∠DCA+∠ACE= 120
∴∠AFD=∠DCE
∴△AFD≌△DCE
∴AD=DE
Delta ade is an equilateral triangle.