Question 168
In triangle $ABC$, the angle bisector of $\angle A$ intersects the angle bisector of $\angle C$ at point $E$. On the angle bisector of $\angle A$, a point $D$ is chosen such that $EC = ED$ and $E$ lies between points $A$ and $D$. If $ACDB$ is a cyclic quadrilateral, determine $\angle B$.