Answer:
50° parallel lines subtended on circumference theorem, and congruent angles seen as subtended on same arc lone examples attached.
∠ DEG = 50°
Explanation:
Angles on the circle subtended by the same arc are congruent.
∠ CFG and ∠ DEG are angles on the circle subtended by arc CD , then
∠ DEG = ∠ CFG = 50°
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