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Read Chapter 11 Surface areas and Volumes of NCERT Class 9 Mathematics
Study this fun chapter from NCERT Book Class 9 Maths Surface Areas And Volumes to learn new things in Class 9 Mathematics. Need help with answers? Check the NCERT Solutions for Class 9 Mathematics to solve every question at the end of the chapter.
NCERT Class 9 Mathematics Chapter 11 Surface areas and Volumes PDF
Wherever we look, usually we see solids. So far, in all our study, we have been dealing with figures that can be easily drawn on our notebooks or blackboards. These are called plane figures. We have understood what rectangles, squares and circles are, what we mean by their perimeters and areas, and how we can find them. We have learned these in earlier classes. It would be interesting to see what happens if we cut out many of these plane figures of the same shape and size from cardboard sheet and stack them up in a vertical pile. By this process, we shall obtain some solid figures (briefly called solids) such as a cuboid, a cylinder, etc. In the earlier classes, you have also learnt to find the surface areas and volumes of cuboids, cubes and cylinders. We shall now learn to find the surface areas and volumes of cuboids and cylinders in details and extend this study to some other solids such as cones and spheres.
13.2 Surface Area of a Cuboid and a Cube
Have you looked at a bundle of many sheets of paper? How does it look? Does it look like what you see in Fig. 13.1?
That makes up a cuboid. How much of brown paper would you need, if you want to cover this cuboid? Let us see:
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NCERT Book for Class 9 Mathematics Chapter 11 Surface areas and Volumes
Class 9 Mathematics Chapter 11 Surface areas and Volumes Official E-Book
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