A pair of adjacent angles can be illustrated with the angles formed by two intersecting lines. For example, if you have two lines that cross each other, they create four angles. Consider angle A and angle B, which share a common vertex and a common side. Since they are next to each other without overlapping, angle A and angle B are a pair of adjacent angles. Another common example is the angles formed at the corners of a rectangle or square, where each corner forms adjacent angles of 90 degrees.