Angle CAB = 80
Angle CBA = 80
Angle ACB = 20
Angle AEC = 10
Angle EAB = 70
Angle DBA = 60
Angle AFB = 50
Angle DFE = 50
Angle DFA = 130
Angle EFB = 130
Angle ADB = 40
Angle CDE = 60
Angle AEB = 30
Angle DEC = 100
Angle BDE = 80

Which in turn makes Angel a = 50

If you add the values of AEB (30) + DEC (100) = 130 + 50 = 180