Respuesta :

Since the angle 120 is on a straight line you will need to subtract 120 from 180 and your answer is 60
Supernova

Angle b and the angle adjacent to it are forming a straight line, so this means that the two angles will add up to 180 degrees.

Make them add up to 180 in an equation and solve for b.

b + 120 = 180

---Subtract 120 from both sides.

b = 60