Question

please answer this question fast 5 th one

Answer 1

Angle OAB = 20    Angle AED = 120

Also  BC= OA

Thus Angle OAB = Angle ABC             [Alternate angles]

Thus angle ABC= 20 deg
Now
In triangle ACB
 Angle BAC + Angle ABC + Angle ACB = 180
        angle BAC + 90 + 20 = 180
         Angle BAC = 180 - 110
                          = 70 deg

In quad ACEF
Angle EFC + 90 + 70 + 120 = 360
Angle EFC = 360 - 280
                  = 80
Thus CFD = 180 - 80 = 100 deg