One pair of supplementary angles is angle RUP and angle RUS. See figure 1 (attached image below). These two angles combine together to form a straight angle. By definition, supplementary angles add to 180 degrees.
Another pair of supplementary angles is angle QUS and angle TUS. See figure 2 (attached image below). These angles form the straight line ST.
There are other ways to form a straight line with two angles.
