 Hello and welcome to the session. Let us discuss the following version. It says, find the distance between px1, y1 and qx2, y2, when pq is parallel to yx's to pq is parallel to xx's. Let us now move on to the solution and let us discuss the first case when pq is parallel to yx's. Now we see that when pq is parallel to yx's every point on this line have same abscissa that is x1 is equal to x2. That means distance between the point pq is just the distance of the point y2 and y1. So the distance between pq is mod of y2 minus y1. Now we find the distance between p and q when pq is parallel to xx's. Now we see that when pq is parallel to xx's every point on this line has same ordinate that is y1 is equal to y2. That is value of y does not change on the line parallel to xx's. So the distance between the point pq is just the difference of x2 and x1 that is pq is equal to mod x2 minus x1. Hence distance between pq is mod of y2 minus y1 if pq is parallel to yx's. And distance between p and q is mod of x2 minus x1 if pq is parallel to xx's. So this completes the question. Hope you enjoyed the session. Goodbye and take care.