作EF⊥AB于点F,则EF=AD=1/2AB
∵AB=AE
∴EF=1/2AE
∴∠BAE =30°
∵AB =AE
∴∠ABE=75°
∴∠CBE =90°-75°=15°
(2)
∵AB =2AD =4,EF =AD =2
∴△ABE的面积=1/2*4*2=4cm²
作EF⊥AB于点F,则EF=AD=1/2AB
∵AB=AE
∴EF=1/2AE
∴∠BAE =30°
∵AB =AE
∴∠ABE=75°
∴∠CBE =90°-75°=15°
(2)
∵AB =2AD =4,EF =AD =2
∴△ABE的面积=1/2*4*2=4cm²