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. Given the first angle is 60 degrees and the second angle is 80 degrees, we can find the third angle by subtracting the sum of these two angles from 180 degrees. So, 180 - (60 + 80) = 180 - 140 = 40 degrees.