Angle Sum Property Of A Triangle

Given:
If CE || DB, this indicates that CE and DB are parallel lines.
When a transversal crosses parallel lines, corresponding angles are equal. In this scenario, angle DCB is a corresponding angle to angle ECD because they are both at the intersection of the transversal with the parallel lines.
Let's denote angle DCB by and angle ECD by . Since DCB and ECD are corresponding angles:

From the problem, it's given that .
Because corresponding angles are equal and CE || DB:
The value of is .