 Hi and welcome to the session. Today we will discuss the following question. The question says, Rukhsar painted the outside of the cabinet of measure 1 meter by 2 meter by 1.5 meter. How much surface area did she cover if she painted all except the bottom of the cabinet? Before proceeding for the solution, let's recall the formula of total surface area of a cuboid. Which is equal to 2 into L into B plus B into H plus H into L, where L is the length, V is the width and H is the height of the cuboid. This is the key idea for this question. Now let's see its solution. In the question, it is given that Rukhsar painted all the cabinet except the bottom. So to find out the painted area, we will find the total surface area of the cabinet and then we will subtract the area of the bottom. Now as we can observe that the cabinet is a cuboid, so first of all we will find out the total surface area of the cuboid in cabinet. So for the cabinet, length that is L is equal to 2 meters, width that is B is equal to 1 meter, width that is H is equal to 1.5 meters. Therefore total surface area of the cabinet is equal to 2 into L into B plus B into H plus H into L. Substituting the values, we get 2 into L into B that is 2 into 1 plus B into H that is 1 into 1.5 plus H into L that is 1.5 into 2. And the unit will be meter into meter that is meter square. This gives plus 1.5 plus 3 meter square and this is equal to 13 meter square. The area of the bottom of the cabinet, so let us write for the bottom of the cabinet. Now the bottom of the cabinet is in a rectangular shape with length equal to 2 meters and width equal to 1 meter. So we will write length that is L is equal to 2 meters and width that is B is equal to 1 meter. Now area of the bottom is equal to length into and L is equal to 2 meters, so 2 meters into B that is 1 meter and this is equal to 2 meters square. We already know that the area painted is equal to this area of the cabinet area of the bottom substituting their values. Total surface area of the cabinet is 13 meter square and area of the bottom is 2 meter square. So 13 meter square minus 2 meter square is equal to 11 meter square. So rucksack has painted 11 meter square of the area of the cabinet and thus this is a required answer. With this we finish this session. Hope you must have understood the question. Goodbye, take care and have a nice day.