 Hello and welcome to the session. In this session we discussed the following question which says, find the lines of symmetry of the following figures, ellipse and isosilistropesium. Before we move on to the solution, let's discuss what is the line of symmetry. A figure is said to be symmetrical about a line if it is identical on either side of the line. And this line is called the line of symmetry. This is the key idea for this question. Let's move on to the solution now. First we have the figure ellipse. We will find the line of symmetry for ellipse. This is an ellipse. Now we will find the lines of symmetry for this ellipse. As you can see we have drawn two lines. Now these two lines are the lines of symmetry for ellipse because this ellipse would be identical on either side of the line AB and also of the line CD. So we say that ellipse has two lines of symmetry namely AB and CD. Next consider the figure isosilistropesium. This AB-CD is an isosilistropesium in which we have AB is parallel to CD and AD is equal to BC. This line that we have drawn is the line of symmetry for isosilistropesium AB-CD because the figure would be identical on either side of this line. Let this line be ES. Thus we say that isosilistropesium has only one line of symmetry and in this case the line of symmetry is EF. So this completes this session. Hope you have understood the solution for this question.