In a triangle, the measure of the first angle is 60 degrees, and the measure of the second angle is 80 degrees. What is the measure of the third angle?
Correct: A
The sum of the angles in a triangle is always 180 degrees. With the first angle being 60 degrees and the second angle being 80 degrees, we subtract these from 180 to find the third angle: 180 - 60 - 80 = 40 degrees.