Answer :

Given: ABCD, ABEF are two cyclic quadrilaterals and BCD = 110°


In Quadrilateral ABCD


We know that,


In a cyclic quadrilateral opposite angles are supplementary


BCD + BAD = 180°


110° + BAD = 180°


BAD = 180° 110° = 70°


Similarly in Quadrilateral ABEF


BAD + BEF = 180°


70° + BEF = 180°


BEF = 180° – 70° = 110°


BEF = 110°

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