Vertical angles are pairs of angles that are opposite each other when two lines intersect, and they are always equal in measure. A linear pair of angles consists of two adjacent angles that form a straight line, making them supplementary, meaning their measures add up to 180 degrees. The degree measure of a straight line is 180 degrees. Given that angle 2 and the angle measuring 41 degrees are supplementary, angle 2 measures 139 degrees. Consequently, angle 3, being vertical to angle 2, also measures 139 degrees.