 Hi and welcome to the session. Today we will learn about area of a parallelogram. Area of a parallelogram is equal to base into height. Now here we have a parallelogram A, B, C, D. So in this parallelogram we can take any of the sides as the base. Suppose we take site A, B as the base. Then the perpendicular zone from the opposite vertex that is from D to A, B will be the height of the parallelogram corresponding to the base A, B. So here D, E is the height corresponding to the base A, B. And that's the area of this parallelogram will be base A, B into height V, E. Let's take an example for this. We are given that area of a parallelogram is equal to 60 cm2 and its base is 15 cm. And we need to find the height of the parallelogram. Now we know that area of the parallelogram is equal to base into height. So 16 cm2 will be equal to base that is 15 cm into height. So from this we get height equal to 60 upon 15 cm which will be equal to 4 cm. Now our next topic is area of a triangle, area of a triangle is equal to half into base into height. Here in triangle A, B, C if we take B, C as the base of the triangle then its height will be the perpendicular zone from the opposite vertex that is from vertex A to the base B, C. So here A, D is the height corresponding to the base B, C. Now in a triangle also we can take any of the sides as the base of the triangle. Thus here the area of triangle A, B, C will be given by half into base B, C into its corresponding height A, D. Let's take an example for this. Suppose we are given that area of a triangle is equal to 224 m2 and the height of the triangle is equal to 16 m. So we need to find the length of the base of the triangle. We already know that area of the triangle is half into base into height. So from this we have 224 m2 will be equal to half into base into height that is 16 m. So this implies base will be equal to 224 into 2 upon 16 m which will be equal to 28 m. Thus the length of the base of the triangle is 28 m. Now let's see an important fact regarding the area of the triangles. We know that congruent triangles are always equal in area. Here we have three triangles which are on same base A, B and where heights are also equal. So that means these three triangles are equal in area. But we can see this clearly that these three triangles are not congruent to each other. So that means triangles which are congruent to each other will be equal in area but it is not necessary that the triangles which are equal in area will be congruent. So we have all the congruent triangles are equal in area but the triangles equal in area need not be congruent. Thus in this session we have learnt about area of parallelogram and area of a triangle. With this we finish this session. Hope you must have understood all the concepts. Goodbye, take care and have a nice day.