ABCD is a cyclic quadrilateral and angle A = 120 degree − x degree, then angle C = ____.
ABCD is a quadrilateral inscribed in a circle with centre O. If ∠COD=120 degrees and ∠BAC=30 degrees, then the value of ∠BCD ( in degrees) is ___
ABCD is a cyclic quadrilateral, in which ∠DBC=80∘ and ∠BAC=40∘. ∠BCD (in degrees ) = ___ .