In this secant-secant relationship, since they intersect inside the circle, they form two angles, each intercepting either of the arcs. You should have observed that[b] one-half[/b] of the [b]sum[/b] of [b]Arcs DC[/b] and [b]BE[/b] is [b]equal [/b]to the angles they make, [b]Angles DFE[/b] and [b]BFE[/b].