Answer:
m = 55°
Step-by-step explanation:
The 2 top interior angles of the triangle are adjacent angles on a line, then
180° - 115° = 65°
180° - 120° = 60°
The sum of the 3 angles in a triangle = 180°
Subtract the sum of the 2 angles fro 180° for third angle
third angle = 180° - (65 + 60)° = 180° - 125° = 55°
m is vertically opposite the third angle and congruent to it
m = 55°
