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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