Find the missing angle measurement.
A. 41°
B. 49°
C. 139°
D. 149°

Answer:
C: 139
Step-by-step explanation:
180 - 29 - 12 = 139.
Every triangle has a total of 180 degrees, therefore, subtract the degrees you do have, and find the missing one. Quadrilaterals have a total of 360 degrees and pentagons have 540 degrees.