Adjacent angles share a side and have the same vertex point.
When you are given the 3-letter names of the angles, as here, adjacent angles will have 2 letters the same (the common side), and the same middle letter (the common vertex).
Adjacent angles<span> are two </span>angles<span> that have a common vertex and a common side.
<OPN and <TSP have a common side but do not have a common vertex. <OPN and <RSU do not have a common side or a common vertex. <OPN and <QPN are adjacent angles. They have a common side and a common vertex. <OPN and <QPS have common vertex but do not have a common side.</span>