In cyclic quadrilateral ABCD
AD =BC,
∠BAC=30∘ and ∠CBD=70∘; find :
(i) ∠BCD (ii) ∠BCA
(iii) ∠ABC (iv) ∠ADC
Given and
(angles in the same segment)
(angles in the same segment)
(opposite angles in a cyclic quadrilateral are supplementary)
Therefore