one angle of a triangle is 120 the other two are congruent what is the measure of the other two angles

Question

total numer of angles in a triangle

Answer 1

Since the sum of the interior angles of a triangle is always 180, then we know that the sum of the two unknown angles is equal to 180 - 120, or 60.  Since the two unknown angles are congruent (equal), then they must be 60/2, or 30 degrees.