In triangle ABC, angle A = 60 degrees and angle C = 50 degrees, find the value of angle B.

In triangle ABC it is known:

Angle A = 60 °;
Angle C = 50 °;
Find corner B.

Solution:

If the sum of all angles in a triangle is 180 ° and 2 other angles are known, then we can find the third angle, that is, angle B.

Angle B = 180 ° – Angle A – Angle C = 180 ° – 60 ° – 50 ° = 120 ° – 50 ° = 100 ° + 20 ° – 50 ° = 50 ° + 20 ° = 70 °.

As a result, we got that the third angle of the triangle ABC is equal to: angle B = 70 °.