The chapter 13 begins with the introduction of solids and solids made up of combinations of two or more basic solids which we encounter in day-to-day life. Then the formula to determine the total surface area of a combination of solids is introduced. An exercise follows this concept which has basic problems that can be solved using the formula discussed in the previous section. Next, the concept of the volume of a combination of solids is introduced and the formula to calculate the same is presented. Then we have the concept of conversion of solid from one shape to another and an exercise follows it. The concept of the frustum of a right circular cone is introduced and the formula to determine its volume, curved surface area and total surface area is discussed.

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