Circles : Math CBSE 9 : Ex 9.3 Q6

Circles : Math CBSE 9 : Ex 9.3 Q6
ABCD is a cyclic quadrilateral whose diagonals intersect at a point E. If ∠ DBC = 70°,
∠ BAC is 30°, find ∠ BCD. Further, if AB = BC, find ∠ ECD.