Find the unknown angle of a triangle if its two angles are 50 and 30 degrees.

Given:
ABC – triangle,
angle A = 50 degrees,
angle B = 30 degrees.
Find the degree measure of the angle C -?
Decision:
We know that the sum of the degree measures of any triangle is 180 degrees.
Therefore, angle A + angle B + angle C = 180;
angle C = 180 – angle A – angle B;
Knowing that angle A = 50 degrees and angle B = 30 degrees.
We get: angle C = 180 – 50 – 30;
angle C = 130 – 30;
angle C = 30 degrees.
Answer: angle C = 30 degrees.