 Hello and welcome to the session. In this session we will use Genetic shapes, measures and their properties to describe real life objects. Let us understand it with the help of an illustration. Let us take an example of a tree trunk. Now here we are given a tree trunk and we have to identify its shape. For this we see what shape to get. When we cut the trunk horizontally now when we cut it by a plane horizontally we get a circular cross section also we see that there are no edges and there are two circular bases now let us draw its geometric shape so here we have two circular bases and a curved surface so we can say that it is a cylinder so whenever we have to model a tree we take a circular base and draw a cylindrical shape and if we are given radius and height of a tree we can find its volume and surface area using the formula of volume of cylinder and surface area of a cylinder Now let us take another example here we are given two tents and we want to identify their shapes Now in the first figure we see that tent will have triangular cross section and it has 5 faces, 6 corners and 9 edges so this tent is a triangular prism Now in the second tent we can see that there are no sharp edges and here we can see that the base is a circle and the vertex just lie above the center of the base circular cross section so when we model a conical tent we will have a circular base whose radius will give us radius of circle and height of cone will give height of tent and when we are given radius, its volume using formulas of volume of cone and surface area of cone so in this fashion we have learnt how to use geometric shapes measures and their properties to describe real life objects and this completes our fashion, hope you all have enjoyed the fashion