In triangle ABC, angle B = 45 degrees and angle = 34 degrees. Determine the value of angle A.

1) Let us find out what is the common degree measure of the two angles of the triangle ABC, if we know that the angle B is 45 °, and the angle C has 34 °.

34 + 45 = 79 °.

2) Let’s find out what is the degree measure of angle A in triangle ABC, if we learned that the total sum of degrees of angles B and C is 79 °, and we know that the whole triangle has 180 °.

180 – 79 = 101 °.

Answer: Angle A in triangle ABC is 101 °.