Answer:
180 Degrees
Explanation:
So, m∠1 = m∠2 = m∠3 means that these angles are the same degrees
The question asks whats the degree of m∠CDG so first we find those points. In this image, it looks like points C,D and G form a line which is also equivalant to 180.
I hope you understand! If not, i'll try to elaborate more