Answer :
ABCD is cyclic quadrilateral.
∴ ∠ABC + ∠ADC = 180°
⇒ 92° + ∠ADC = 180°
⇒ ∠ADC = 88°
AE || CD
∴∠EAD = ∠ADC = 88°
Now,
∠BCD = 180° - ∠DAB
⇒ ∠BCD = ∠DAF = ∠EAD + ∠EAF
⇒ ∠BCD = 88° + 20°
⇒ ∠BCD = 108°
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