 Hi and welcome to the session. Today we will learn about perimeter and area of squares and rectangles. We already know that perimeter is the distance around a closed figure. Now perimeter of a regular polygon is equal to number of sides into length of one side. Now square is a regular polygon and all the sides of a square are equal. So that means perimeter of a square is equal to side plus side plus side plus side that is 4 into side. Also number of sides of a square is 4. So its perimeter will be 4 into side that is number of sides into length of one side. Now let us consider a rectangle this is the length of the rectangle denoted by n and this is the breadth of the rectangle denoted by v. So perimeter of the rectangle will be equal to length plus width plus length plus width that means perimeter of a rectangle is given by 2 into n plus v. Now let us move on to area we know that area is the region occupied by a closed figure. So this whole region is the area of the square and area of a square is given by side into side. Now let us move on to rectangle area of a rectangle is equal to length into width that is n into v. Here this whole region is the area of the given rectangle. Let us take an example we are given that area of a square part is equal to the area of the rectangular part. Here we have a square part and a rectangular part and the areas are equal. Now we are also given that the side of the square part is 60 meters and the length of the rectangular part is 90 meters. We need to find the perimeter of the rectangular part. We need to find the breadth of the rectangular part. Now we are given that area of the square part is equal to the area of the rectangular part. That means area of the square part that is side into side that is 60 meters into 60 meters will be equal to area of the rectangular part An area of a rectangle is length into breadth so this will be equal to 90 meters into v which is the breadth of the rectangle. From this we get breadth that is v will be equal to 60 into 60 upon 90 meters which will be equal to 40 meters. That means breadth of the rectangle is 40 meters. Now we need to find the perimeter of the rectangular part so this will be equal to 2 plus v that is 90 plus 40 meters which will be equal to 216 meters. Now our next topic is triangles as parts of rectangles. Here we have a rectangle a b c d. Now suppose we cut this rectangle along its diagonal v d into two triangles that is triangle a v d and triangle c v d. We will find that these two triangles are exactly same in size. They both are equal in area and are congruent to each other. So area of each triangle will be equal to half into area of rectangle. These four triangles combine together to form the rectangle a b c d. We have a square p q r s and now suppose we divide this square in four equal parts like this. Then we will notice that all these four triangles are exactly same in size. They all are congruent to each other and are equal in area. So area of each triangle will be equal to 1 by 4 into area of square together to form the square p q r s. They are congruent parts of rectangle in six equal parts. Now we have given that the length of this rectangle is 9 centimeters and the length of this rectangle is 4 centimeters. And we need to find the area of one part. That all these six parts are exactly same in size. They are congruent to each other and are equal in area. Thus area of each part will be equal to 1 by 6 into area of rectangle. This will be equal to 1 by 6 into meters into 4 centimeters which will be equal to 6 centimeters square. Thus area of one part is equal to 6 centimeters square. With this reference session hope you must have enjoyed it. Goodbye and take care.