Here, let us look into some of the terms associated with quadrilaterals. So, we cannot just incite and now let us consider a quadrilateral ABCD. Now, what does consecutive or adjacent side mean? Two sides of a quadrilateral are consecutive or adjacent sides if they have a common vertex or if they share a point between them. So, AD and AB are adjacent sides because they share this common vertex. Similarly, AB and BC are adjacent sides because they share a vertex or a point. Again, BC and CD are adjacent sides because they share a point. And CD and AD are adjacent sides because they also share a common vertex. This is called consecutive edges or sides. So, let me summarize and write them down for you. Here, we have AB and BC, BC and CD, CD and DA, and DA and AB. These are the four pairs of adjacent sides in this given quadrilateral ABCD.