70 градусов
а решение?
BEA = CED = 40
BEC = AED = (360 - (40+40))/2 = 140
EBC = ECB = (180-140)/2 = 20
ABE = 90 - 20 = 70

Ответы и объяснения

2013-10-19T17:17:14+04:00
BEA = CED = 40 
BEC = AED = (360 - (40+40))/2 = 140
EBC = ECB = (180-140)/2 = 20
ABE = 90 - 20 = 70