 Hi and how are you all today? Let us proceed on with the question and remember I am Priyanka. Now the question says what universal set or sets would you propose for each of the following. Now the first part is the set of right triangles, the second part is the set of isosceles triangle. So for each of the following we need to tell the universal sets. Now let us first understand what does universal set stand for. In a particular contest we have to deal with the elements and subsets of a basic set which is relevant to the particular contest. The basic set is called the universal set. So that means it is the basic set from which we take the elements and subsets in particular context. This is our key idea that we are going to use in order to proceed on with our solution and it will be more understood by you when you will be dealing with some of its questions. So let us start with the first part that will help you to explain this concept. Move clearly. The set of right triangles. Right the basic set of the given set is the set of all triangles. So our basic set is set of all triangles. Right. Now also the basic set can be set of triangles which have one angle greater than or equal to 90 degrees. So our basic set is set of all triangles which have one angle greater than or equal to 90 degrees. Right. Similarly basic set could be set of triangles which have at least one triangle that means or one angle greater than equal to 90 degrees or less than equal to 90 degrees. Right. So these are the three basic sets which can be formed and the answer will be set of triangles, set of triangles in which one angle is greater than equal to 90 degrees or it can be set of triangles in which one angle is less than equal to 90 degrees. Right. So that means this becomes the answer of our first part. Proceeding on with the second part. Now here we have the set of isosceles triangles. The basic set of the given set is the set of all triangles and this set contains isosceles triangles also. So clearly our answer can be set of triangles that is a universal set from which this set can be taken out. So this completes the question that was given to us. Using these universal sets we can use and make use of various subsets and elements that are used in our frequent daily life. Right. Bye for now.