 Hi and welcome to the session. Today we will learn some constructions related to perpendicular's. Before moving on to the constructions, let's see what are perpendicular lines. Two lines say L and M are perpendicular to each other if the angles formed between them are right angles. So each angle is 90 degrees. So first of all, let us see the construction of perpendicular per point on it. So here we are given a line and a point. So we have a line L and a point X on it. Now centre and any radius A and with X as centre means place the pointer of your compasses at point X and open your compasses with any radius and draw an arc to cut the line L at points A and B like this. So we got the points A and B more than as centre draw two arcs at each other Y like this. Now join XY. XY is the required perpendicular to line L and we will write XY is perpendicular to line L. This symbol is used to show perpendicular to. Now let's move on to the next construction. That is perpendicular through a point X construction we are given a line L and a point. So we have a point X over here X as centre, any radius draw an arc to cut line B like this with A and B as centre each other. So we got the point Y XY. So we got XY as the perpendicular to line L. That means XY is perpendicular to line L. So let's move on to our next construction. That is the perpendicular bisector of a line segment. Next construction as our first step draw a line segment of any length this one. Now open compasses half of AB. Now throughout the construction keep the radius same that is more than half of AB. A as centre on both sides line segment AB. Next with B as centre draw two arcs on both sides of line segment AB at points lastly join PQ. Thus is the perpendicular bisector line segment AB. So in this session we have learnt to construct a perpendicular to a line through a point on it, perpendicular to a line through a point not on it or bisector of a line segment. With this we finish this session. Hope you have understood all the constructions. Goodbye, take care and have a nice day.