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A vertical pair of angles are two angles that are opposite each other when two lines intersect. In this case, we have four angles: 1, 2, 3, and 4.
Since 1 is given as 98°, we are looking for the angle that is opposite to it when the lines intersect.
In this case, angle 3 is opposite to angle 1, so angle 3 is a vertical pair with angle 1.