 Hello and welcome to the session. In this session we discuss the following question it says, in the figure m is parallel to n, if pr is perpendicular to m, qs is perpendicular to m and pr is equal to 3 centimeters, find qs. This is the figure given to us in which we have m is parallel to n, then pr is perpendicular to m, qs is also perpendicular to m and we have given that pr is equal to 3 centimeters, we have to find the length of qs. Before we move on to the solution let's recall one fact which says that the perpendicular distance between two parallel lines which is also called the distance between two parallel lines is the same throughout. This is the key idea to be used in this question. Now let's see the solution. We are given this figure in which we have line m is parallel to the line n, then pr is perpendicular to line m, qs is perpendicular to line m, we are given pr equal to 3 centimeters and we have to find qs. Now since we are given that m is parallel to n, so the perpendicular distance between is same throughout since we know that the perpendicular distance between two parallel lines is the same throughout and pr is the perpendicular distance between the two parallel lines m and n and we are given that pr is equal to 3 centimeters. Also this qs is the perpendicular distance between the parallel lines m and n as pr is also the perpendicular distance between the parallel lines m and n. So qs would be the same as pr which is 3 centimeters. So we get qs is equal to 3 centimeters. So this is our final answer. This completes the session. Hope you have understood the solution of this question.