Question: abcd is a cyclic quadrilateral of which ab is the diameter?
Answer: ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing it and ∠ADC=140∘, than ∠BAC is equal to. Solution : Given, ABCD is a cyclic quadriilateral and ∠ADC=140∘. We know that, sum of the opposite angles in a cyclic quadrilateral is 180∘.