Which of the following set of angles forms a triangle?

The sum of the angles in a triangle must be exactly 180°.

Calculate the sum for each set of angles:

Option (a): 60° + 70° + 80° = 210° (not 180°)

Option (b): 60° + 70° + 30° = 160°(not 180°)

Option (c): 60° + 40° + 80° = 180° (this forms a triangle)

Option (d): 60° + 50° + 80° = 190° (not 180°)

Thus, The set of angles that forms a triangle is option(c): 60°, 40°, 80°