If two angles of a triangle measure $$60^∘$$ and $$80^∘,$$​ respectively, then the measure of the third angle of this triangle is:

Correct option is A

Given:

Two angles of triangle = 60° and 80°

Concept used:

Sum of interior angles of a triangle = 180°

Solution:

Third angle of the triangle = 180° - (60° + 80°)

= 180° - 140°

= 40°

Thus, correct option is (a)