 Hello and welcome to this session. In this session, we will discuss a question which says that draw a triangle with vertices l whose coordinates are 2 minus 3, m whose coordinates are minus 2,1 and n whose coordinates are 2,5 and find the length of the site l,n. Now before starting the solution of this question, we should know a result. And that is if we have a point a with coordinates x, y1 and a point b with coordinates x, y2 where x is fixed and ab forms a vertical line, then length of ab is equal to absolute value of y2 minus y1. Now this result will work out as a key idea for solving out the given question. Now let us start with the solution of the given question. Now here we have to draw a triangle with vertices l, m and n. Now here we have drawn a coordinate plane with horizontal axis as x axis and vertical axis as y axis. First of all, let us plot the point m with coordinates 2 minus 3. Now here the x coordinate is positive, y coordinate is negative. It means this point will lie in the fourth coordinate. Now as the x coordinate is positive, so we will start from 0 and we will move 2 units to the right of 0 and then the y coordinate is minus 3, so we will move 3 units downwards and we will reach at this point which is the point l whose coordinates are 2 minus 3. Then the next point which we have to plot is m whose coordinates are minus 2, 1. Now here x coordinate is negative, y coordinate is positive. It means it will lie in the second coordinate. Now here this is the point m with coordinates minus 2, 1. Then the next point is m with coordinates 2, 5. Now here both x and y coordinates are positive. It means it will lie in the first coordinate. Now here this is the point n with coordinates 2, 5. So we have got the 3 points on the coordinate plane that is the points l, m, n. Now we will join these 3 points consecutively, that is l, m. Now on joining these 3 points we get a triangle which is a polygon with 3 sides given by length of side l, n which is a vertical line. Now the coordinate is 3 and the coordinates of n are 2, 5. Now here you can see that the x coordinate these points is same. Now the y coordinate varies. Now using the result which is given in the key idea, we can find the length of a vertical line AB whose x coordinate is fixed, the length of a vertical line segment l and y coordinate varies. Now let this be y1 and let this be y2 is equal to absolute value of y2 minus y1 of 5 minus of minus 3 is equal to absolute value of 8. That is equal to, is equal to 18 minutes. That's the given question and that's all for this session. Hope you all have enjoyed this session.