Surface area and volume is a topic in the NCERT book for Class 9 Maths that deals with the measurement of the outer and inner space occupied by various solids, such as cuboids, cubes, cylinders, cones, spheres, and hemispheres. The chapter teaches how to find the surface area and volume of these solids using their dimensions, such as length, breadth, height, radius, slant height, etc. The chapter also explains how to find the surface area and volume of combinations of solids, such as a cylinder with two hemispheres at its ends, a cone with a hemisphere at its base, etc. The chapter has four exercises with different types of questions, such as finding the surface area and volume of given solids, finding the dimensions of solids from their surface area and volume, finding the cost of painting or covering the surface of solids, finding the capacity of containers, etc. The chapter aims to develop the mathematical skills and spatial reasoning of the students. It also helps them to apply the concepts of surface area and volume in real-life situations, such as designing buildings, packing objects, storing liquids, etc. The chapter is an important part of the Class 9 Maths syllabus and prepares the students for higher-level studies.
