∠ACD=∠ACB+∠BCD
∠ACD−∠ACB=∠BCD
120∘−40∘=∠BCD
∠BCD=80∘
Question 19
In the given figure, BC = CA and ∠A=40∘. Then, ∠ACD is equal to a) 40∘ b) 80∘ c) 120∘ d) 60∘
ABCD is a cyclic quadrilateral, in which ∠DBC =80∘ and ∠BAC = 40∘ . Find ∠BCD.