ABCD is a cyclic quadrilateral whose diagonals intersect at a point E. If ∠DBC=70∘, ∠BAC=30∘ and AB=BC, find ∠ECD.

ABCD is a cyclic quadrilateral whose diagonals intersect at a point E.

1.	ABCD is a cyclic quadrilateral whose diagonals intersect at a point E. If ∠DBC=70∘, ∠BAC=30∘ and AB=BC, find ∠ECD.
Answer» $A B C D$ is a cyclic quadrilateral whose diagonals intersect at a point $E .$ If $∠ D B C = 70^{\circ}, ∠ B A C = 30^{\circ}$ and $A B = B C,$ find $∠ E C D$ .