Answer:
120
Step-by-step explanation:
all triangles inside angles are equal to 180, because you can tell by looking at it, all the angles in this triangle are the same. so 180 divide by 3 is 60. 60⁰ is the angle for the inside part, but you need the outside. So 180⁰ (the angle of a straight line) minus 60 is 120⁰.
