48°, 50°, 74°
A. This set forms a triangle.
B. This set doesn't form a triangle.
A. This set forms a triangle.
To determine if a set of three angles forms a triangle, we can apply the triangle inequality theorem. According to this theorem, the sum of the measures of any two angles in a triangle must be greater than the measure of the third angle.
In this case, let's find the sum of the two smaller angles:
48° + 50° = 98°
Now let's compare this sum to the measure of the largest angle:
98° < 74°
Since the sum of the two smaller angles is not greater than the measure of the largest angle, these angles do not satisfy the triangle inequality theorem. Therefore, this set does not form a triangle.
Hence, the correct answer is B. This set doesn't form a triangle.