Question

Imagine a triangle with a line extending out of it, I know two of the angles are 63° and 60°.
I know the missing angle in the triangle is 57. The angle 57 is next to the line with the missing angle.
But I am solving for angle m1.
How do I solve this or set this up?
It's a multiple choice:
A. 57°
B. 63°
C. 117°
D. 123°

I'm sorry this is so confusing.. I'd be grateful for any help
I think it's 123?

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