Answer:
76°
Step-by-step explanation:
[tex]m \angle \: 1 + m \angle \: 2 + m \angle \: 3 = 180 \degree \\ \\ 90 \degree + 14 \degree + m \angle \: 3 = 180 \degree \\ \\ 104 \degree + m \angle \: 3 = 180 \degree \\ \\ m \angle \: 3 = 180 \degree -104 \degree \\ \\ m \angle \: 3 = 76 \degree [/tex]
