 Hello and welcome to the session. I am Shashi and I am going to help you with the following question. Question says, A drinking glass is in the shape of a frustum of a cone of height 14 cm. The diameter of its two circular ends are 4 cm and 2 cm. Find the capacity of the glass. First of all, let us understand that volume of the frustum of a cone whose height is h and r1 and r2 are radii of two circular ends is equal to 1 upon 3 pi h multiplied by r1 square plus r2 square plus r1 r2. Now we will use this formula as our key idea to solve the given question. Let us now start with the solution. Now we are given that height of the glass which is in the shape of a frustum of cone is equal to 14 cm. So we can write height of given glass that is h is equal to 14 cm and we are also given that diameter of its two circular ends is equal to 4 cm and 2 cm. So we can write diameter of one circular end is equal to 4 cm. Now this implies radius of this circular end that is r1 is equal to half of 4 cm which is further equal to 2 cm. We know radius is equal to half of diameter. Similarly we can write diameter of other circular end is equal to 2 cm. Now this implies radius of other circular end that is r2 is equal to half of 2 cm that is 1 cm. Now we have to find capacity of the glass. We know capacity of the glass is equal to volume of the glass. It is equal to 1 upon 3 pi h multiplied by square of r1 plus square of r2 plus r1 r2. We know glass is in the shape of frustum of a cone and from key idea we know volume of frustum of a cone is equal to this expression. Now we will substitute corresponding value of h r1 and r2 in this expression. Now we get capacity of glass is equal to 1 upon 3 multiplied by 22 upon 7. We know value of pi is equal to 22 upon 7, h is equal to 14 cm, value of r1 is 2 cm and r2 is equal to 1 cm. Now simplifying this expression we get 44 upon 3 multiplied by 4 plus 1 plus 2 cm cube. Now this is further equal to 44 upon 3 multiplied by 7 cm cube. Adding these three terms we get 7. Now multiplying these two terms we get 308 upon 3 cm cube. Now this is further equal to 102 2 upon 3 cm cube. So we get capacity of glass is equal to 102 2 upon 3 cm cube. So this is our required answer. This completes the session. Hope you understood the solution. Take care and keep smiling.